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Ballardini N, Kramer MS, Oken E, Henderson AJ, Bogdanovich N, Dahhou M, Patel R, Thompson J, Vilchuck K, Yang S, Martin RM, Flohr C. Associations of atopic dermatitis and asthma with child behaviour: Results from the PROBIT cohort. Clin Exp Allergy 2019; 49:1235-1244. [PMID: 31081565 DOI: 10.1111/cea.13417] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 04/02/2019] [Accepted: 04/14/2019] [Indexed: 12/31/2022]
Abstract
BACKGROUND Conflicting findings from studies evaluating associations of allergic disease with child behaviour require longitudinal studies to resolve. OBJECTIVE To estimate the magnitude of associations of atopic dermatitis (AD) in infancy, and symptoms of asthma and AD at 6.5 years, with child behaviour at 6.5 years. METHODS Secondary cohort analysis of the Promotion of Breastfeeding Intervention Trial (PROBIT). PROBIT enrolled 17 046 infants at birth and followed them up at 6.5 years (n = 13 889). Study paediatricians collected data on infantile AD at repeated follow-up examinations during the first year of life. At 6.5 years, paediatricians performed skin prick tests and parents reported asthma and AD symptoms during the prior year. In addition, parents and teachers completed the Strength and Difficulties Questionnaire, which includes scales on hyperactivity/inattention, emotional problems, conduct problems, peer problems and prosocial behaviours. RESULTS Physician-diagnosed AD in the first year of life was not associated with increased risk for behavioural problems at 6.5 years. Emotional problems at 6.5 years were more common among children with AD symptoms (OR: 2.24, 95% CI: 1.62-3.12) and asthma symptoms (OR: 1.45; 95% CI: 1.07-1.96) during the past year at 6.5 years and ORs for children with symptoms of more severe AD and asthma were also higher. AD in the past year was also associated with probable hyperactivity/inattention disorder at 6.5 years (OR: 2.05; 95% CI: 1.09-3.84). Other subscales of the SDQ were not related to asthma or AD symptoms during the past year. CONCLUSIONS AND CLINICAL RELEVANCE Children with AD symptoms were at higher risk for concomitant hyperactivity/inattention and emotional disorder, and children with asthma symptoms were at higher risk of having concomitant emotional problems. However, AD during infancy did not predict childhood behaviours.
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Affiliation(s)
- Natalia Ballardini
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.,Sachs' Children and Youth Hospital, Södersjukhuset, Stockholm, Sweden.,St John's Institute of Dermatology, King's College London, London, UK
| | - Michael S Kramer
- Department of Epidemiology, Biostatistics and Occupational Health, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
| | - Emily Oken
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts
| | - Alexander John Henderson
- Department of Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Natalia Bogdanovich
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Mourad Dahhou
- Departments of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
| | - Rita Patel
- Department of Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Jennifer Thompson
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts
| | - Konstantin Vilchuck
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Seungmi Yang
- Departments of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
| | - Richard M Martin
- Department of Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK.,University Hospitals Bristol NHS Foundation Trust, National Institute for Health Research, Bristol Biomedical Research Centre, University of Bristol, Bristol, UK.,Medical Research Council Integrative Epidemiology Unit, University of Bristol, Bristol, UK
| | - Carsten Flohr
- St John's Institute of Dermatology, Guy's and St Thomas' Hospital, NHS Foundation Trust and King's College London, London, UK
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Yang S, Martin RM, Oken E, Hameza M, Doniger G, Amit S, Patel R, Thompson J, Rifas-Shiman SL, Vilchuck K, Bogdanovich N, Kramer MS. Breastfeeding during infancy and neurocognitive function in adolescence: 16-year follow-up of the PROBIT cluster-randomized trial. PLoS Med 2018; 15:e1002554. [PMID: 29677187 PMCID: PMC5909901 DOI: 10.1371/journal.pmed.1002554] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Accepted: 03/15/2018] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Evidence on the long-term effect of breastfeeding on neurocognitive development is based almost exclusively on observational studies. In the 16-year follow-up study of a large, cluster-randomized trial of a breastfeeding promotion intervention, we evaluated the long-term persistence of the neurocognitive benefits of the breastfeeding promotion intervention previously observed at early school age. METHODS AND FINDINGS A total of 13,557 participants (79.5% of the 17,046 randomized) of the Promotion of Breastfeeding Intervention Trial (PROBIT) were followed up at age 16 from September 2012 to July 2015. At the follow-up, neurocognitive function was assessed in 7 verbal and nonverbal cognitive domains using a computerized, self-administered test battery among 13,427 participants. Using an intention-to-treat (ITT) analysis as our prespecified primary analysis, we estimated cluster- and baseline characteristic-adjusted mean differences between the intervention (prolonged and exclusive breastfeeding promotion modelled on the Baby-Friendly Hospital Initiative) and control (usual care) groups in 7 cognitive domains and a global cognitive score. In our prespecified secondary analysis, we estimated mean differences by instrumental variable (IV) analysis to account for noncompliance with the randomly assigned intervention and estimate causal effects of breastfeeding. The 16-year follow-up rates were similar in the intervention (79.7%) and control groups (79.3%), and baseline characteristics were comparable between the two. In the cluster-adjusted ITT analyses, children in the intervention group did not show statistically significant differences in the scores from children in the control group. Prespecified additional adjustment for baseline characteristics improved statistical precision and resulted in slightly higher scores among children in the intervention for verbal function (1.4 [95% CI 0.3-2.5]) and memory (1.2 [95% CI 0.01-2.4]). IV analysis showed that children who were exclusively breastfed for ≥3 (versus <3) months had a 3.5-point (95% CI 0.9-6.1) higher verbal function, but no differences were observed in other domains. While our computerized, self-administered cognitive testing reduced the cluster-level variability in the scores, it may have increased individual-level measurement errors in adolescents. CONCLUSIONS We observed no benefit of a breastfeeding promotion intervention on overall neurocognitive function. The only beneficial effect was on verbal function at age 16. The higher verbal ability is consistent with results observed at early school age; however, the effect size was substantially smaller in adolescence. PROBIT TRIAL REGISTRATION ClinicalTrials.gov NCT01561612.
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Affiliation(s)
- Seungmi Yang
- Department of Epidemiology, Biostatistics and Occupational Health, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
| | - Richard M. Martin
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, United Kingdom
| | - Emily Oken
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts, United States of America
| | - Mikhail Hameza
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Glen Doniger
- NeuroTrax Corporation, Medina, New York, United States of America
| | - Shimon Amit
- NeuroTrax Corporation, Medina, New York, United States of America
| | - Rita Patel
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
| | - Jennifer Thompson
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts, United States of America
| | - Sheryl L. Rifas-Shiman
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts, United States of America
| | - Konstantin Vilchuck
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Natalia Bogdanovich
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Michael S. Kramer
- Department of Epidemiology, Biostatistics and Occupational Health, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
- Department of Pediatrics, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
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Flohr C, Henderson AJ, Kramer MS, Patel R, Thompson J, Rifas-Shiman SL, Yang S, Vilchuck K, Bogdanovich N, Hameza M, Martin RM, Oken E. Effect of an Intervention to Promote Breastfeeding on Asthma, Lung Function, and Atopic Eczema at Age 16 Years: Follow-up of the PROBIT Randomized Trial. JAMA Pediatr 2018; 172:e174064. [PMID: 29131887 PMCID: PMC6583261 DOI: 10.1001/jamapediatrics.2017.4064] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
IMPORTANCE Atopic diseases, including asthma and atopic eczema, are the most common chronic conditions of childhood. OBJECTIVE To investigate whether an intervention to promote prolonged and exclusive breastfeeding protects against asthma, atopic eczema, and low lung function in adolescence. DESIGN, SETTING, AND PARTICIPANTS Follow-up of the Promotion of Breastfeeding Intervention Trial (PROBIT), a cluster randomized trial in 30 Belarusian maternity hospitals and affiliated polyclinics; recruitment of 17 046 healthy term infants took place from June 15, 1996, to December 31, 1997. Data analysis was conducted from May 9, 2016, to April 21, 2017. The primary analytic approach was by modified intention-to-treat analysis. INTERVENTIONS Randomization to receive a breastfeeding promotion intervention vs usual care. MAIN OUTCOMES AND MEASURES Spirometry and flexural eczema on standardized skin examination by study pediatricians were the primary outcomes; secondary outcomes were self-reported asthma diagnosis ever, and wheezing and flexural eczema symptoms in the previous year. RESULTS A total of 13 557 (79.5%) participants were followed up from September 15, 2012 to July 15, 2015. The intervention (7064 [79.7%]) and control (6493 [79.4%]) groups were similar at follow-up (3590 [50.8%] and 3391 [52.2%] male; mean [SD] age, 16.2 [0.6] and 16.1 [0.5] years, respectively). In the intervention group, 0.3% (21 of 7064) had flexural eczema on skin examination and mean (SD) forced expiratory volume in the first second of expiration/forced vital capacity (FEV1/FVC) ratio z score was -0.10 (1.82), compared with 0.7% (43 of 6493) and 0.35 (1.34), respectively, in the control group. In modified intention-to-treat analysis, accounting for clustering by polyclinic, a 54% lower risk of flexural eczema on skin examination was observed in the intervention compared with the control group (odds ratio [OR], 0.46; 95% CI, 0.25 to 0.86). Self-reported flexural eczema symptoms in the past year (OR, 0.57; 95% CI, 0.27 to 1.18), asthma (OR, 0.76; 95% CI, 0.47 to 1.23), and wheezing in the past year (OR, 0.66; 95% CI, 0.37 to 1.18) were less frequently reported in the intervention compared with the control group, but 95% CIs were wide and included the null. There was no significant difference in the FEV1/FVC ratio z score (β -0.15; 95% CI, -0.76 to 0.45). All results were similar with additional adjustment for baseline characteristics, on instrumental variable analysis, and with multiple imputation among all 17 046 randomized participants. CONCLUSIONS AND RELEVANCE A breastfeeding promotion intervention reduced flexural dermatitis risk but had no detectable effect on lung function or questionnaire-derived measures of atopic eczema or asthma in adolescence in a setting where atopic eczema and allergies are rare. TRIAL REGISTRATION clinicaltrials.gov Identifier: NCT01561612.
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Affiliation(s)
- Carsten Flohr
- Unit for Population-Based Dermatology Research, St John’s Institute of Dermatology, Division of Genetics and Molecular Medicine, King’s College London and Guy’s & St Thomas’ National Health Service Foundation Trust, London, England
| | - A. John Henderson
- School of Social and Community Medicine, University of Bristol, Bristol, England
| | - Michael S. Kramer
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Rita Patel
- School of Social and Community Medicine, University of Bristol, Bristol, England
| | - Jennifer Thompson
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts
| | - Sheryl L. Rifas-Shiman
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts
| | - Seungmi Yang
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada,Department of Pediatrics, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Konstantin Vilchuck
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Natalia Bogdanovich
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Mikhail Hameza
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Richard M. Martin
- School of Social and Community Medicine, University of Bristol, Bristol, England,Medical Research Council Integrative Epidemiology Unit, University of Bristol, Bristol, England
| | - Emily Oken
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts
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Martin RM, Kramer MS, Patel R, Rifas-Shiman SL, Thompson J, Yang S, Vilchuck K, Bogdanovich N, Hameza M, Tilling K, Oken E. Effects of Promoting Long-term, Exclusive Breastfeeding on Adolescent Adiposity, Blood Pressure, and Growth Trajectories: A Secondary Analysis of a Randomized Clinical Trial. JAMA Pediatr 2017; 171:e170698. [PMID: 28459932 PMCID: PMC5576545 DOI: 10.1001/jamapediatrics.2017.0698] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
IMPORTANCE Evidence that breastfeeding reduces child obesity risk and lowers blood pressure (BP) is based on potentially confounded observational studies. OBJECTIVE To investigate the effects of a breastfeeding promotion intervention on adiposity and BP at age 16 years and on longitudinal growth trajectories from birth. DESIGN, SETTING, AND PARTICIPANTS Cluster-randomized Promotion of Breastfeeding Intervention Trial. Belarusian maternity hospitals and affiliated polyclinics (the clusters) were allocated into intervention (n = 16) or control arms (n = 15) in 1996 and 1997. The trial participants were 17 046 breastfeeding mother-infant pairs; of these, 13 557 children (79.5%) were followed up at 16 years of age between September 2012 and July 2015. INTERVENTIONS Breastfeeding promotion, modeled on the Baby-Friendly Hospital Initiative. MAIN OUTCOMES AND MEASURES Body mass index (BMI, calculated as weight in kilograms divided by height in meters squared); fat and fat-free mass indices and percentage of body fat from bioimpedance; waist circumference; overweight and obesity; height; BP; and longitudinal growth trajectories. The primary analysis was modified intention-to-treat (without imputation for losses to follow-up) accounting for within-clinic clustering. RESULTS We examined 13 557 children at a median age of 16.2 years (48.5% were girls). The intervention substantially increased breastfeeding duration and exclusivity compared with the control arm (exclusively breastfed: 45% vs 6% at 3 months, respectively). Mean differences at 16 years between intervention and control groups were 0.21 (95% CI, 0.06-0.36) for BMI; 0.21 kg/m2 (95% CI, -0.03 to 0.44) for fat mass index; 0.00 kg/m2 (95% CI, -0.21 to 0.22) for fat-free mass index; 0.71% (95% CI, -0.32 to 1.74) for percentage body fat; -0.73 cm (-2.48 to 1.02) for waist circumference; 0.05 cm (95% CI, -0.85 to 0.94) for height; -0.54 mm Hg (95% CI, -2.40 to 1.31) for systolic BP; and 0.71 mm Hg (95% CI, -0.68 to 2.10) for diastolic BP. The odds ratio for overweight/obesity (BMI ≥85th percentile vs <85th percentile) was 1.14 (95% CI, 1.02-1.28) and the odds ratio for obesity (BMI ≥95th percentile vs <95th percentile) was 1.09 (95% CI, 0.92-1.29). The intervention resulted in a more rapid rate of gain in postinfancy height (1 to 2.8 years), weight (2.8 to 14.5 years), and BMI (2.8 to 8.5 years) compared with the control arm. The intervention had little effect on BMI z score changes after 8.5 years. CONCLUSIONS AND RELEVANCE A randomized intervention that increased the duration and exclusivity of breastfeeding was not associated with lowered adolescent obesity risk or BP. On the contrary, the prevalence of overweight/obesity was higher in the intervention arm. All mothers initiated breastfeeding, so findings may not apply to comparisons of the effects of breastfeeding vs formula feeding. TRIAL REGISTRATION isrctn.org: ISRCTN37687716; and clinicaltrials.gov: NCT01561612.
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Affiliation(s)
- Richard M Martin
- School of Social and Community Medicine, University of Bristol, Bristol, UK, BS8 2PS,University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK,Medical Research Council Integrative Epidemiology Unit at the University of Bristol, Bristol, UK, BS8 2BN
| | - Michael S. Kramer
- Departments of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada, QC H3A 1A2
| | - Rita Patel
- School of Social and Community Medicine, University of Bristol, Bristol, UK, BS8 2PS
| | - Sheryl L. Rifas-Shiman
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, 401 Park Drive Suite 401E, Boston, USA, MA 02215
| | - Jennifer Thompson
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, 401 Park Drive Suite 401E, Boston, USA, MA 02215
| | - Seungmi Yang
- Departments of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada, QC H3A 1A2
| | - Konstantin Vilchuck
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Natalia Bogdanovich
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Mikhail Hameza
- National Research and Applied Medicine Mother and Child Centre, Minsk, Republic of Belarus
| | - Kate Tilling
- School of Social and Community Medicine, University of Bristol, Bristol, UK, BS8 2PS
| | - Emily Oken
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, 401 Park Drive Suite 401E, Boston, USA, MA 02215
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Wade KH, Kramer MS, Oken E, Timpson NJ, Skugarevsky O, Patel R, Bogdanovich N, Vilchuck K, Davey Smith G, Thompson J, Martin RM. Prospective associations between problematic eating attitudes in midchildhood and the future onset of adolescent obesity and high blood pressure. Am J Clin Nutr 2017; 105:306-312. [PMID: 27974308 PMCID: PMC5267301 DOI: 10.3945/ajcn.116.141697] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 11/15/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Clinically diagnosed eating disorders may have adverse cardiometabolic consequences, including overweight or obesity and high blood pressure. However, the link between problematic eating attitudes in early adolescence, which can lead to disordered eating behaviors, and future cardiometabolic health is, to our knowledge, unknown. OBJECTIVE We assessed whether variations in midchildhood eating attitudes influence the future development of overweight or obesity and high blood pressure. DESIGN Of 17,046 children who participated in the Promotion of Breastfeeding Intervention Trial (PROBIT), we included 13,557 participants (79.5% response rate) who completed the Children's Eating Attitudes Test (ChEAT) at age 11.5 y and in whom we measured adiposity and blood pressure at ages 6.5, 11.5, and 16 y. We assessed whether ChEAT scores ≥85th percentile (indicative of problematic eating attitudes) compared with scores <85th percentile at age 11.5 y were associated with new-onset overweight, obesity, high systolic blood pressure, or high diastolic blood pressure between midchildhood and early adolescence. RESULTS After controlling for baseline sociodemographic confounders, we observed positive associations of problematic eating attitudes at age 11.5 y with new-onset obesity (OR: 2.18; 95% CI: 1.58, 3.02), new-onset high systolic blood pressure (OR: 1.34; 95% CI: 1.05, 1.70), and new-onset high diastolic blood pressure (OR: 1.25; 95% CI: 0.99, 1.58) at age 16 y. After further controlling for body mass index at age 6.5 y, problematic eating attitudes remained positively associated with new-onset obesity (OR: 1.80; 95% CI: 1.28, 2.53); however, associations with new-onset high blood pressure were attenuated (OR: 1.14; 95% CI: 0.89, 1.45 and OR: 1.09; 95% CI: 0.86, 1.39 for new-onset systolic and diastolic blood pressure, respectively). CONCLUSIONS Problematic eating attitudes in midchildhood seem to be related to the development of obesity in adolescence, a relatively novel observation with potentially important public health implications for obesity control. PROBIT was registered at clinicaltrials.gov as NCT01561612 and isrctn.com as ISRCTN37687716.
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Affiliation(s)
- Kaitlin H Wade
- School of Social and Community Medicine, Faculty of Health Sciences, .,Medical Research Council Integrative Epidemiology Unit, and
| | - Michael S Kramer
- Departments of Pediatrics and.,Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Emily Oken
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA
| | - Nicholas J Timpson
- School of Social and Community Medicine, Faculty of Health Sciences.,Medical Research Council Integrative Epidemiology Unit, and
| | - Oleg Skugarevsky
- Department of Psychiatry and Medical Psychology, Belarusian State Medical University, Minsk, Belarus; and
| | - Rita Patel
- School of Social and Community Medicine, Faculty of Health Sciences
| | - Natalia Bogdanovich
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Konstantin Vilchuck
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - George Davey Smith
- School of Social and Community Medicine, Faculty of Health Sciences.,Medical Research Council Integrative Epidemiology Unit, and
| | - Jennifer Thompson
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA
| | - Richard M Martin
- School of Social and Community Medicine, Faculty of Health Sciences.,Medical Research Council Integrative Epidemiology Unit, and.,University Hospitals Bristol National Health Service Foundation Trust, National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, United Kingdom
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6
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Richmond RC, Skugarevsky O, Yang S, Kramer MS, Wade KH, Patel R, Bogdanovich N, Vilchuck K, Sergeichick N, Smith GD, Oken E, Martin RM. The association of early childhood cognitive development and behavioural difficulties with pre-adolescent problematic eating attitudes. PLoS One 2014; 9:e104132. [PMID: 25102171 PMCID: PMC4125275 DOI: 10.1371/journal.pone.0104132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Accepted: 07/11/2014] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES Few studies have prospectively investigated associations of child cognitive ability and behavioural difficulties with later eating attitudes. We investigated associations of intelligence quotient (IQ), academic performance and behavioural difficulties at 6.5 years with eating attitudes five years later. METHODS We conducted an observational cohort study nested within the Promotion of Breastfeeding Intervention Trial, Belarus. Of 17,046 infants enrolled at birth, 13,751 (80.7%) completed the Children's Eating Attitude Test (ChEAT) at 11.5 years, most with information on IQ (n = 12,667), academic performance (n = 9,954) and behavioural difficulties (n = 11,098) at 6.5 years. The main outcome was a ChEAT score ≥ 85th percentile, indicative of problematic eating attitudes. RESULTS Boys with higher IQ at 6.5 years reported fewer problematic eating attitudes, as assessed by ChEAT scores ≥ 85th percentile, at 11.5 years (OR per SD increase in full-scale IQ = 0.87; 0.79, 0.94). No such association was observed in girls (1.01; 0.93, 1.10) (p for sex-interaction = 0.016). In both boys and girls, teacher-assessed academic performance in non-verbal subjects was inversely associated with high ChEAT scores five years later (OR per unit increase in mathematics ability = 0.88; 0.82, 0.94; and OR per unit increase in ability for other non-verbal subjects = 0.86; 0.79, 0.94). Behavioural difficulties were positively associated with high ChEAT scores five years later (OR per SD increase in teacher-assessed rating = 1.13; 1.07, 1.19). CONCLUSION Lower IQ, worse non-verbal academic performance and behavioural problems at early school age are positively associated with risk of problematic eating attitudes in early adolescence.
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Affiliation(s)
- Rebecca C. Richmond
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC Integrative Epidemiology Unit (IEU), University of Bristol, Bristol, United Kingdom
| | - Oleg Skugarevsky
- Psychiatry and Medical Psychology Department, Belarussian State Medical University, Minsk, Belarus
| | - Seungmi Yang
- Departments of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada
| | - Michael S. Kramer
- Departments of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada
| | - Kaitlin H. Wade
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC Integrative Epidemiology Unit (IEU), University of Bristol, Bristol, United Kingdom
| | - Rita Patel
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
| | - Natalia Bogdanovich
- The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Konstantin Vilchuck
- The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Natalia Sergeichick
- The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - George Davey Smith
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC Integrative Epidemiology Unit (IEU), University of Bristol, Bristol, United Kingdom
| | - Emily Oken
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School and the Harvard Pilgrim Health Care Institute, Boston, Massachusetts, United States of America
| | - Richard M. Martin
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC Integrative Epidemiology Unit (IEU), University of Bristol, Bristol, United Kingdom
- National Institute of Health Research (NIHR) Bristol Biomedical Research Unit in Nutrition, University Hospitals Bristol NHS Trust and University of Bristol, Bristol, United Kingdom
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7
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Skugarevsky O, Wade KH, Richmond RC, Martin RM, Tilling K, Patel R, Vilchuck K, Bogdanovich N, Sergeichick N, Davey Smith G, Gillman MW, Oken E, Kramer MS. Effects of promoting longer-term and exclusive breastfeeding on childhood eating attitudes: a cluster-randomized trial. Int J Epidemiol 2014; 43:1263-71. [PMID: 24706729 DOI: 10.1093/ije/dyu072] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Observational studies suggest that breastfeeding benefits later maternal child-feeding practices, which in turn may contribute to positive eating attitudes. We investigated the effect of a randomized intervention to increase duration and exclusivity of breastfeeding on pre-adolescent eating attitudes. METHODS Long-term follow-up of the Promotion of Breastfeeding Intervention Trial (PROBIT), a cluster-randomized trial in 31 maternity hospitals and affiliated polyclinics in Belarus. Sites were randomly assigned an experimental intervention to promote longer duration and exclusivity of breastfeeding in mothers who initiated breastfeeding (n = 16 sites), or a control intervention of continuing usual care (n = 15 sites); 17 046 healthy infants were enrolled in 1996-7, of whom 13 751 (80.7%) completed the Children's Eating Attitude Test (ChEAT) at 11.5 years of age. A ChEAT score ≥ 22.5 (85th percentile) was used as an indicator of problematic eating attitudes. Analysis was based on intention-to-treat, accounting for clustering within hospitals/clinics. RESULTS Compared with the control arm, the experimental intervention substantially increased breastfeeding exclusivity (43.3% vs 6.4% exclusively breastfed at 3 months of age) and duration of any breastfeeding throughout infancy. The proportion of children with ChEAT scores ≥ 22.5 was lower in the experimental than control arm (boys 11.4% vs 17.2%; girls 18.5% vs 23.4%) [cluster-adjusted odds ratio (OR), boys: 0.44; 95% confidence interval (CI): 0.21,0.93; girls: 0.51; 95% CI: 0.27,0.99). Results were robust to adjustment for potential confounders and using a ChEAT score ≥ 25.5 (91st percentile) as the outcome (OR: 0.53; 95% CI: 0.28,1.03). CONCLUSIONS An intervention to improve the duration and exclusivity of breastfeeding among term infants in Belarus was associated with a reduction in problematic eating attitudes at 11.5 years of age.
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Affiliation(s)
- Oleg Skugarevsky
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Kaitlin H Wade
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, CanadaPsychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Rebecca C Richmond
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, CanadaPsychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Richard M Martin
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, CanadaPsychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, CanadaPsychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospital
| | - Kate Tilling
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Rita Patel
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Konstantin Vilchuck
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Natalia Bogdanovich
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Natalia Sergeichick
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - George Davey Smith
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, CanadaPsychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Matthew W Gillman
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Emily Oken
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
| | - Michael S Kramer
- Psychiatry and Medical Psychology Department, Belarusian State Medical University, Minsk, Belarus, School of Social and Community Medicine, University of Bristol, Bristol, UK, Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK, University of Bristol / University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Nutrition Biomedical Research Unit, University of Bristol, Bristol, UK, National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA and Department of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Quebec, Canada
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Martin RM, Patel R, Kramer MS, Vilchuck K, Bogdanovich N, Sergeichick N, Gusina N, Foo Y, Palmer T, Thompson J, Gillman MW, Smith GD, Oken E. Effects of promoting longer-term and exclusive breastfeeding on cardiometabolic risk factors at age 11.5 years: a cluster-randomized, controlled trial. Circulation 2014; 129:321-9. [PMID: 24300437 PMCID: PMC3946966 DOI: 10.1161/circulationaha.113.005160] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/15/2013] [Indexed: 11/16/2022]
Abstract
BACKGROUND The duration and exclusivity of breastfeeding in infancy have been inversely associated with future cardiometabolic risk. We investigated the effects of an experimental intervention to promote increased duration of exclusive breastfeeding on cardiometabolic risk factors in childhood. METHODS AND RESULTS We followed-up children in the Promotion of Breastfeeding Intervention Trial, a cluster-randomized trial of a breastfeeding promotion intervention based on the World Health Organization/United Nations Children's Fund Baby-Friendly Hospital Initiative. In 1996 to 1997, 17 046 breastfeeding mother-infant pairs were enrolled from 31 Belarusian maternity hospitals and affiliated polyclinics (16 intervention versus 15 control sites); 13 879 (81.4%) children were followed up at 11.5 years, with 13 616 (79.9%) who had fasted and did not have diabetes mellitus. The outcomes were blood pressure; fasting insulin, adiponectin, glucose, and apolipoprotein A1; and the presence of metabolic syndrome. Analysis was by intention to treat, accounting for clustering within hospitals/clinics. The intervention substantially increased breastfeeding duration and exclusivity in comparison with the control arm (43% versus 6% and 7.9% versus 0.6% exclusively breastfed at 3 and 6 months, respectively). Cluster-adjusted mean differences at 11.5 years between experimental versus control groups were as follows: 1.0 mm Hg (95% confidence interval, -1.1 to 3.1) for systolic and 0.8 mm Hg (-0.6 to 2.3) for diastolic blood pressure; -0.1 mmol/L (-0.2 to 0.1) for glucose; 8% (-3% to 34%) for insulin; -0.3 μg/mL (-1.5 to 0.9) for adiponectin; and 0.0 g/L (-0.1 to 0.1) for apolipoprotein A1. The cluster-adjusted odds ratio for metabolic syndrome, comparing experimental versus control groups, was 1.21 (0.85 to 1.72). CONCLUSIONS An intervention to improve breastfeeding duration and exclusivity among healthy term infants did not influence cardiometabolic risk factors in childhood. CLINICAL TRIAL REGISTRATION Current Controlled Trials: ISRCTN37687716 (http://www.controlled-trials.com/ISRCTN37687716). URL: http://clinicaltrials.gov. Unique identifier: NCT01561612.
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Affiliation(s)
- Richard M Martin
- School of Social and Community Medicine, University of Bristol, Bristol, UK
- Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK
- National Institute for Health Research, Bristol Biomedical Research Unit in Nutrition, Bristol, UK
| | - Rita Patel
- School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Michael S. Kramer
- Departments of Pediatrics and of Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada
| | - Konstantin Vilchuck
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Natalia Bogdanovich
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Natalia Sergeichick
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Nina Gusina
- National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus
| | - Ying Foo
- School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Tom Palmer
- Division of Health Sciences, Warwick Medical School, University of Warwick, Coventry, UK
| | - Jennifer Thompson
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA
| | - Matthew W Gillman
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA
| | - George Davey Smith
- School of Social and Community Medicine, University of Bristol, Bristol, UK
- Medical Research Council / University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK
| | - Emily Oken
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA
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Oken E, Patel R, Guthrie LB, Vilchuck K, Bogdanovich N, Sergeichick N, Palmer TM, Kramer MS, Martin RM. Effects of an intervention to promote breastfeeding on maternal adiposity and blood pressure at 11.5 y postpartum: results from the Promotion of Breastfeeding Intervention Trial, a cluster-randomized controlled trial. Am J Clin Nutr 2013; 98:1048-56. [PMID: 23945719 PMCID: PMC3778859 DOI: 10.3945/ajcn.113.065300] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 07/09/2013] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Differences between mothers who do and do not succeed in breastfeeding are likely to confound associations of lactation with later maternal adiposity. OBJECTIVE We compared adiposity and blood pressure (BP) in women randomly assigned to an intervention to promote prolonged and exclusive breastfeeding or usual care. DESIGN We performed a cluster-randomized trial at 31 hospitals in Belarus in 1996-1997. RESULTS Of 17,046 women enrolled at delivery, we assessed 11,867 women (69.6%) at 11.5 y postpartum. The prevalence of exclusive breastfeeding ≥3 mo was 44.5% in 6321 women in the intervention group and 7.1% in 5546 women in the control group. At 11.5 y postpartum, mean (±SD) body mass index (BMI; in kg/m(2)) was 26.5 ± 5.5, the percentage of body fat was 33.6% ± 8.3%, and systolic BP was 124.6 ± 14.6 mm Hg. On intention-to-treat analysis (without imputation) with adjustment for clustering by hospital, mean outcomes were lower in intervention compared with control mothers for BMI (mean difference: -0.27; 95% CI: -0.91, 0.37), body fat (-0.49%; 95% CI: -1.25%, 0.27%), and systolic BP (-0.81 mm Hg; 95% CI: -3.33, 1.71 mm Hg), but effect sizes were small, CIs were wide, and results were attenuated further toward the null after adjustment for baseline characteristics. Results were similar in sensitivity analyses [ie, by using conventional observational analyses disregarding treatment assignment, instrumental variable analyses to estimate the causal effect of breastfeeding, and multiple imputation to account for missing outcome measures (n = 17,046)]. CONCLUSION In women who initiated breastfeeding, an intervention to promote longer breastfeeding duration did not result in an important lowering of adiposity or BP. This trial was registered at clinicaltrials.gov as NCT01561612 and at Current Controlled Trials as ISRCTN37687716.
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Affiliation(s)
- Emily Oken
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA and the Medical Research Council/University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, United Kingdom
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10
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Martin RM, Patel R, Oken E, Thompson J, Zinovik A, Kramer MS, Vilchuck K, Bogdanovich N, Sergeichick N, Foo Y, Gusina N. Filter paper blood spot enzyme linked immunoassay for adiponectin and application in the evaluation of determinants of child insulin sensitivity. PLoS One 2013; 8:e71315. [PMID: 23936498 PMCID: PMC3731301 DOI: 10.1371/journal.pone.0071315] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Accepted: 06/27/2013] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Adiponectin is an adipocyte-derived hormone that acts as a marker of insulin sensitivity. Bloodspot sampling by fingerstick onto filter paper may increase the feasibility of large-scale studies of the determinants of insulin sensitivity. We first describe the validation of an enzyme-linked immunoassay (ELISA) for quantifying adiponectin from dried blood spots and then demonstrate its application in a large trial (PROBIT). METHODS We quantified adiponectin from 3-mm diameter discs (≈3 µL of blood) punched from dried blood spots obtained from: i) whole blood standards (validation); and ii) PROBIT trial samples (application) in which paediatricians collected blood spots from 13,879 children aged 11.5 years from 31 sites across Belarus. We examined the distribution of bloodspot adiponectin by demographic and anthropometric factors, fasting insulin and glucose. RESULTS In the validation study, mean intra-assay coefficients of variation (n=162) were 15%, 13% and 10% for 'low' (6.78 µg/ml), 'medium' (18.18 µg/ml) and 'high' (33.13 µg/ml) internal quality control (IQC) samples, respectively; the respective inter-assay values (n=40) were 23%, 21% and 14%. The correlation coefficient between 50 paired whole bloodspot versus plasma samples, collected simultaneously, was 0.87 (95% CI: 0.78 to 0.93). Recovery of known quantities of adiponectin (between 4.5 to 36 µg/ml) was 100.3-133%. Bloodspot adiponectin was stable for at least 30 months at -80°C. In PROBIT, we successfully quantified fasting adiponectin from dried blood spots in 13,329 of 13,879 (96%) children. Mean adiponectin (standard deviation) concentrations were 17.34 µg/ml (7.54) in boys and 18.41 µg/ml (7.92) in girls and were inversely associated with body mass index, fat mass, triceps and subscapular skin-fold thickness, waist circumference, height and fasting glucose. CONCLUSIONS Bloodspot ELISA is suitable for measuring adiponectin in very small volumes of blood collected on filter paper and can be applied to large-scale studies.
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Affiliation(s)
- Richard M Martin
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom.
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Martin RM, Patel R, Kramer MS, Guthrie L, Vilchuck K, Bogdanovich N, Sergeichick N, Gusina N, Foo Y, Palmer T, Rifas-Shiman SL, Gillman MW, Smith GD, Oken E. Effects of promoting longer-term and exclusive breastfeeding on adiposity and insulin-like growth factor-I at age 11.5 years: a randomized trial. JAMA 2013; 309:1005-13. [PMID: 23483175 PMCID: PMC3752893 DOI: 10.1001/jama.2013.167] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
IMPORTANCE Evidence that longer-term and exclusive breastfeeding reduces child obesity risk is based on observational studies that are prone to confounding. OBJECTIVE To investigate effects of an intervention to promote increased duration and exclusivity of breastfeeding on child adiposity and circulating insulin-like growth factor (IGF)-I, which regulates growth. DESIGN, SETTING, AND PARTICIPANTS Cluster-randomized controlled trial in 31 Belarusian maternity hospitals and their affiliated clinics, randomized into 1 of 2 groups: breastfeeding promotion intervention (n = 16) or usual practices (n = 15). Participants were 17,046 breastfeeding mother-infant pairs enrolled in 1996 and 1997, of whom 13,879 (81.4%) were followed up between January 2008 and December 2010 at a median age of 11.5 years. INTERVENTION Breastfeeding promotion intervention modeled on the WHO/UNICEF Baby-Friendly Hospital Initiative (World Health Organization/United Nations Children's Fund). MAIN OUTCOME MEASURES Body mass index (BMI), fat and fat-free mass indices (FMI and FFMI), percent body fat, waist circumference, triceps and subscapular skinfold thicknesses, overweight and obesity, and whole-blood IGF-I. Primary analysis was based on modified intention-to-treat (without imputation), accounting for clustering within hospitals and clinics. RESULTS The experimental intervention substantially increased breastfeeding duration and exclusivity when compared with the control (43% vs 6% exclusively breastfed at 3 months and 7.9% vs 0.6% at 6 months). Cluster-adjusted mean differences in outcomes at 11.5 years of age between experimental vs control groups were: 0.19 (95% CI, -0.09 to 0.46) for BMI; 0.12 (-0.03 to 0.28) for FMI; 0.04 (-0.11 to 0.18) for FFMI; 0.47% (-0.11% to 1.05%) for percent body fat; 0.30 cm (-1.41 to 2.01) for waist circumference; -0.07 mm (-1.71 to 1.57) for triceps and -0.02 mm (-0.79 to 0.75) for subscapular skinfold thicknesses; and -0.02 standard deviations (-0.12 to 0.08) for IGF-I. The cluster-adjusted odds ratio for overweight/obesity (BMI ≥ 85th vs <85th percentile) was 1.18 (95% CI, 1.01 to 1.39) and for obesity (BMI ≥ 95th vs <85th percentile) was 1.17 (95% CI, 0.97 to 1.41). CONCLUSIONS AND RELEVANCE Among healthy term infants in Belarus, an intervention that succeeded in improving the duration and exclusivity of breastfeeding did not prevent overweight or obesity, nor did it affect IGF-I levels at age 11.5 years. Breastfeeding has many advantages but population strategies to increase the duration and exclusivity of breastfeeding are unlikely to curb the obesity epidemic. TRIAL REGISTRATION isrctn.org: ISRCTN37687716; and clinicaltrials.gov: NCT01561612.
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Affiliation(s)
- Richard M Martin
- School of Social and Community Medicine, University of Bristol, Bristol, England.
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Patel R, Oken E, Bogdanovich N, Matush L, Sevkovskaya Z, Chalmers B, Hodnett ED, Vilchuck K, Kramer MS, Martin RM. Cohort profile: The promotion of breastfeeding intervention trial (PROBIT). Int J Epidemiol 2013; 43:679-90. [PMID: 23471837 DOI: 10.1093/ije/dyt003] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The PROmotion of Breastfeeding Intervention Trial (PROBIT) is a multicentre, cluster-randomized controlled trial conducted in the Republic of Belarus, in which the experimental intervention was the promotion of increased breastfeeding duration and exclusivity, modelled on the Baby-friendly hospital initiative. Between June 1996 and December 1997, 17,046 mother-infant pairs were recruited during their postpartum hospital stay from 31 maternity hospitals, of which 16 hospitals and their affiliated polyclinics had been randomly assigned to the arm of PROBIT investigating the promotion of breastfeeding and 15 had been assigned to the control arm, in which breastfeeding practices and policies in effect at the time of randomization was continued. Of the mother-infant pairs originally recruited for the study, 16,492 (96.7%) were followed at regular intervals until the infants were 12 months of age (PROBIT I) for the outcomes of breastfeeding duration and exclusivity; gastrointestinal and respiratory infections; and atopic eczema. Subsequently, 13,889 (81.5%) of the children from these mother-infant pairs were followed-up at age 6.5 years (PROBIT II) for anthropometry, blood pressure (BP), behaviour, dental health, cognitive function, asthma and atopy outcomes, and 13,879 (81.4%) children were followed to the age of 11.5 years (PROBIT III) for anthropometry, body composition, BP, and the measurement of fasted glucose, insulin, adiponectin, insulin-like growth factor-I, and apolipoproteins. The trial registration number for Current Controlled Trials is ISRCTN37687716 and that for ClinicalTrials.gov is NCT01561612. Proposals for collaboration are welcome, and enquires about PROBIT should be made to an executive group of the study steering committee (M.S.K., R.M.M., and E.O.). More information, including information about how to access the trial data, data collection documents, and bibliography, is available at the trial website (http://www.bristol.ac.uk/social-community-medicine/projects/probit/).
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Affiliation(s)
- Rita Patel
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Emily Oken
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Natalia Bogdanovich
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Lidia Matush
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Zinaida Sevkovskaya
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Beverley Chalmers
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Ellen D Hodnett
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Konstantin Vilchuck
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Michael S Kramer
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
| | - Richard M Martin
- School of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UKSchool of Social and Community Medicine, University of Bristol, Bristol, UK, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, USA, The National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus, Belarussian Ministry of Health, Minsk, Belarus, Department of Obstetrics and Gynaecology and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada, Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Ontario, Canada, Departments of Pediatrics & Epidemiology, Biostatistics and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada and MRC Centre for Causal Analyses in Translational Epidemiology (CAiTE), School of Social and Community Medicine, University of Bristol, Bristol, UK
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13
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Martin RM, Patel R, Zinovik A, Kramer MS, Oken E, Vilchuck K, Bogdanovich N, Sergeichick N, Gunnarsson R, Grufman L, Foo Y, Gusina N. Filter paper blood spot enzyme linked immunoassay for insulin and application in the evaluation of determinants of child insulin resistance. PLoS One 2012; 7:e46752. [PMID: 23056434 PMCID: PMC3466324 DOI: 10.1371/journal.pone.0046752] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Accepted: 09/05/2012] [Indexed: 11/18/2022] Open
Abstract
Background In large-scale epidemiology, bloodspot sampling by fingerstick onto filter paper has many advantages, including ease and low costs of collection, processing and transport. We describe the development of an enzyme-linked immunoassay (ELISA) for quantifying insulin from dried blood spots and demonstrate its application in a large trial. Methods We adapted an existing commercial kit (Mercodia Human Insulin ELISA, 10-1113-01) to quantify insulin from two 3-mm diameter discs (≈6 µL of blood) punched from whole blood standards and from trial samples. Paediatricians collected dried blood spots in a follow-up of 13,879 fasted children aged 11.5 years (interquartile range 11.3–11.8 years) from 31 trial sites across Belarus. We quantified bloodspot insulin levels and examined their distribution by demography and anthropometry. Results Mean intra-assay (n = 157) coefficients of variation were 15% and 6% for ‘low’ (6.7 mU/L) and ‘high’ (23.1 mU/L) values, respectively; the respective inter-assay values (n = 33) were 23% and 11%. The intraclass correlation coefficient between 50 paired whole bloodspot versus serum samples, collected simultaneously, was 0.90 (95% confidence interval 0.85 to 0.95). Bloodspot insulin was stable for at least 31 months at −80°C, for one week at +30°C and following four freeze-thaw cycles. Paediatricians collected a median of 8 blood spots from 13,487 (97%) children. The geometric mean insulin (log standard deviation) concentrations amongst 12,812 children were 3.0 mU/L (1.1) in boys and 4.0 mU/L (1.0) in girls and were positively associated with pubertal stage, measures of central and peripheral adiposity, height and fasting glucose. Conclusions Our simple and convenient bloodspot assay is suitable for the measurement of insulin in very small volumes of blood collected on filter paper cards and can be applied to large-scale epidemiology studies of the early-life determinants of circulating insulin.
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Affiliation(s)
- Richard M Martin
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom.
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14
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Guthrie LB, Oken E, Sterne JAC, Gillman MW, Patel R, Vilchuck K, Bogdanovich N, Kramer MS, Martin RM. Ongoing monitoring of data clustering in multicenter studies. BMC Med Res Methodol 2012; 12:29. [PMID: 22413923 PMCID: PMC3313871 DOI: 10.1186/1471-2288-12-29] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Accepted: 03/13/2012] [Indexed: 11/10/2022] Open
Abstract
Background Multicenter study designs have several advantages, but the possibility of non-random measurement error resulting from procedural differences between the centers is a special concern. While it is possible to address and correct for some measurement error through statistical analysis, proactive data monitoring is essential to ensure high-quality data collection. Methods In this article, we describe quality assurance efforts aimed at reducing the effect of measurement error in a recent follow-up of a large cluster-randomized controlled trial through periodic evaluation of intraclass correlation coefficients (ICCs) for continuous measurements. An ICC of 0 indicates the variance in the data is not due to variation between the centers, and thus the data are not clustered by center. Results Through our review of early data downloads, we identified several outcomes (including sitting height, waist circumference, and systolic blood pressure) with higher than expected ICC values. Further investigation revealed variations in the procedures used by pediatricians to measure these outcomes. We addressed these procedural inconsistencies through written clarification of the protocol and refresher training workshops with the pediatricians. Further data monitoring at subsequent downloads showed that these efforts had a beneficial effect on data quality (sitting height ICC decreased from 0.92 to 0.03, waist circumference from 0.10 to 0.07, and systolic blood pressure from 0.16 to 0.12). Conclusions We describe a simple but formal mechanism for identifying ongoing problems during data collection. The calculation of the ICC can easily be programmed and the mechanism has wide applicability, not just to cluster randomized controlled trials but to any study with multiple centers or with multiple observers.
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Affiliation(s)
- Lauren B Guthrie
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School and the Harvard Pilgrim Health Care Institute, Boston, USA
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