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Patel HK, Mehta JP, Patel BA, Ram R, Parmar DV. Pregnancy-related Factors Responsible for Delivering Low Birth Weight Babies: An Institutional-based Cross-sectional Study, Jamnagar, Gujarat. Indian J Community Med 2024; 49:354-359. [PMID: 38665442 PMCID: PMC11042152 DOI: 10.4103/ijcm.ijcm_895_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 11/16/2023] [Indexed: 04/28/2024] Open
Abstract
Background The WHO defines LBW as "Birth weight less than 2500 grams" regardless of gestational age. Being born with a low birth weight also incurs enormous economic costs, including higher medical expenditures and social service expenses, and decreased productivity in adulthood. Objective To study distribution of newborns' according to pregnancy related factors and its association with newborns' birth weight. Methods An institutional based cross-sectional study. New-borns delivered at study institute were considered as study participants. Estimated final sample size was 500. Guardians (mothers) were face-to-face interviewed and also recorded data were collected from the case file and Mother and Child Protection Card. Results Prevalence of LBW newborns was higher in mothers with late ANC registration, <4 ANC visits, chronic medical conditions, infection during pregnancy, PIH, anemia, consuming tobacco, exposure to second hand smoke, LSCS/Assisted delivery, in female newborns', current pregnancy birth order number more than 2, in pre term newborns' and mothers with bad obstetric history. Conclusion Create awareness and adoption of suitable family planning methods. Need to do early (within 12 weeks) ANC registration with minimum four ANC visits for better pregnancy outcome. Effective tracking and suitable intervention provided to improve current pregnancy outcome. Health care professional should pay special attention to high-risk pregnancy. Develop social culture in such a way that females are neither addicted nor exposed to any tobacco containing products in their life.
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Affiliation(s)
- Harsh K. Patel
- Department of Community Medicine, Shree M. P. Shah Government Medical College, Jamnagar, Gujarat, India
| | - Jitesh P. Mehta
- Department of Community Medicine, Shree M. P. Shah Government Medical College, Jamnagar, Gujarat, India
| | - Bela A. Patel
- Department of Community Medicine, Shree M. P. Shah Government Medical College, Jamnagar, Gujarat, India
| | - Rohitkumar Ram
- Department of Community Medicine, Shree M. P. Shah Government Medical College, Jamnagar, Gujarat, India
| | - Dipesh V. Parmar
- Department of Community Medicine, Shree M. P. Shah Government Medical College, Jamnagar, Gujarat, India
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Yusuf H, Stokes J, Wattar BHA, Petrie A, Whitten SM, Siassakos D. Chance of healthy versus adverse outcome in subsequent pregnancy after previous loss beyond 16 weeks: data from a specialized follow-up clinic. J Matern Fetal Neonatal Med 2023; 36:2165062. [PMID: 36632655 DOI: 10.1080/14767058.2023.2165062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
PURPOSE Women with a previous fetal demise have a 2-20 fold increased risk of another stillbirth in a subsequent pregnancy when compared to those who have had a live birth. Despite this, there is limited research regarding the management and outcomes of subsequent pregnancies. This study was conducted to accurately quantify the chances of a woman having a healthy subsequent pregnancy after a pregnancy loss. METHODS A retrospective study was conducted at a tertiary-level unit between March 2019 and April 2021. We collected data on all women with a history of previous fetal demise attending a specialized perinatal history clinic and compared the risk of subsequent stillbirth to those with a normal pregnancy outcome. Outcome data included birth outcome, obstetric and medical complications, gestational age and birth weight and mode of delivery. Those who had healthy subsequent pregnancies were compared with those who experienced adverse outcomes. RESULTS A total of 101 cases were reviewed. Ninety-six women with subsequent pregnancies after a history of fetal demise from 16 weeks were included. Seventy-nine percent of women (n = 76) delivered a baby at term, without complications. Overall, 2.1% had repeat pregnancy losses (n = 2) and 2.1% delivered babies with fetal growth restriction (n = 2). There were no cases of abruption in a subsequent pregnancy. Eighteen neonates were delivered prematurely (18.4%), 15 of these (83.3%) were due to iatrogenic causes and three (16.7%) were spontaneous. In univariable logistic regression analyses, those with adverse outcomes in subsequent pregnancies had greater odds of pre-eclampsia (Odds ratio *(OR) = 3.89, 95% CI = 1.05-14.43, p = .042) and fetal growth restriction (OR = 4.58, 95% CI = 1.41-14.82, p = 0.011) in previous pregnancies compared to those with healthy outcomes. However, in multivariable logistic regression analyses, neither variable had a significant odds ratio (OR = 2.03, 95% CI = 0.44-9.39, p = .366 and OR = 3.42, 95% CI = 0.90 - 13.09, p = .072 for pre-eclampsia and FGR, respectively). CONCLUSION Four in five women had a healthy subsequent pregnancy. This is a reassuring figure for women when contemplating another pregnancy, particularly if cared for in a specialist clinic.
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Affiliation(s)
- Hannah Yusuf
- Institute for Women's Health, University College London, London, United Kingdom of Great Britain and Northern Ireland.,UCL Medical School, University College London, London, United Kingdom of Great Britain and Northern Ireland
| | - Jenny Stokes
- Division of Women's Health, University College London Hospitals NHS Foundation Trust, London, United Kingdom of Great Britain and Northern Ireland
| | - Bassel H Al Wattar
- Institute for Women's Health, University College London, London, United Kingdom of Great Britain and Northern Ireland.,Reproductive Medicine Unit, University College London Hospital, London, United Kingdom of Great Britain and Northern Ireland
| | - Aviva Petrie
- UCL Eastman Dental Institute, University College, London, United Kingdom of Great Britain and Northern Ireland
| | - Sara M Whitten
- Institute for Women's Health, University College London, London, United Kingdom of Great Britain and Northern Ireland.,Division of Women's Health, University College London Hospitals NHS Foundation Trust, London, United Kingdom of Great Britain and Northern Ireland
| | - Dimitrios Siassakos
- Institute for Women's Health, University College London, London, United Kingdom of Great Britain and Northern Ireland.,Division of Women's Health, University College London Hospitals NHS Foundation Trust, London, United Kingdom of Great Britain and Northern Ireland.,Wellcome EPSRC Centre for Interventional & Surgical Sciences (WEISS), London, United Kingdom of Great Britain and Northern Ireland.,NIHR Biomedical Research Centre, University College London Hospital, London, United Kingdom of Great Britain and Northern Ireland
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Peled T, Nun ELB, Hochler H, Sela HY, Lipschuetz M, Weiss A, Grisaru-Granovsky S, Rottenstreich M. Perinatal outcomes in nulliparous women with a history of multiple pregnancy losses according to number of previous pregnancy losses. Am J Obstet Gynecol MFM 2023; 5:100946. [PMID: 37003569 DOI: 10.1016/j.ajogmf.2023.100946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 03/16/2023] [Accepted: 03/23/2023] [Indexed: 04/03/2023]
Abstract
BACKGROUND While it is widely acknowledged that pregnancy losses can lead to negative outcomes for both mothers and fetuses, there is limited information available on the specific levels of risk associated with each additional pregnancy loss. OBJECTIVE This study aimed to investigate the effect of number of previous pregnancy losses among nulliparous women on maternal and neonatal adverse outcomes. STUDY DESIGN This was a multicenter retrospective cohort study. The study population included all nulliparous women with singleton pregnancies who delivered in all university-affiliated obstetrical centers in a single geographic area between 2003 and 2021. Maternal and neonatal outcomes of women who delivered at our medical centers and had varying numbers of previous pregnancy losses were compared with women who had no previous pregnancy loss. The primary outcome of this study was preterm delivery rate at <37 weeks of gestation. The secondary outcomes were adverse maternal and neonatal outcomes. Univariate analysis was performed using multiple logistic regression modeling. RESULTS During the study period, 97,904 nulliparous women met the inclusion and exclusion criteria. Of those women, 84,245 (86%) had no previous pregnancy losses (reference group), 10,724 (11%) had 1 previous pregnancy loss, 2150 (2.2%) had 2 previous pregnancy losses, 516 (0.5%) had 3 previous pregnancy losses, 160 (0.2%) had 4 previous pregnancy losses, and 99 (0.1%) had ≥5 previous pregnancy losses. Women who had previous pregnancy losses had significantly higher rates of preterm delivery, hypertensive disorders of pregnancy, diabetes mellitus (pregestational and gestational), unplanned cesarean delivery, perinatal death, neonatal intensive care unit admissions, and neonatal hypoglycemia. The risks of preterm delivery and most other adverse obstetrical outcomes correlated with the number of previous pregnancy losses. Multivariate analyses showed that each previous pregnancy loss was associated with an additional, significant, increased risk of preterm delivery of 14% at <37 weeks of gestation, 37% at <34 weeks of gestation, 45% at <32 weeks of gestation, and 77% at <28 weeks of gestation. CONCLUSION A history of previous pregnancy losses increased the risk of preterm delivery and other perinatal outcomes in a dose-dependent manner. To minimize perinatal complications, obstetricians should be aware of the risks and complications in this unique population, consider close monitoring of the cervical length, and maintain high vigilance in case of complications with special attention to other potentially modifiable risks.
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Affiliation(s)
- Tzuria Peled
- Department of Obstetrics and Gynecology, Shaare Zedek Medical Center, affiliated with the Hebrew University School of Medicine, Jerusalem, Israel (Drs Peled, Nun, Sela, Weiss, Grisaru-Granovsky, and Rottenstreich)
| | - Eyal Lang Ben Nun
- Department of Obstetrics and Gynecology, Shaare Zedek Medical Center, affiliated with the Hebrew University School of Medicine, Jerusalem, Israel (Drs Peled, Nun, Sela, Weiss, Grisaru-Granovsky, and Rottenstreich)
| | - Hila Hochler
- Faculty of Medicine, Department of Obstetrics and Gynecology, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel (Drs Hochler and Lipschuetz).
| | - Hen Y Sela
- Department of Obstetrics and Gynecology, Shaare Zedek Medical Center, affiliated with the Hebrew University School of Medicine, Jerusalem, Israel (Drs Peled, Nun, Sela, Weiss, Grisaru-Granovsky, and Rottenstreich)
| | - Michal Lipschuetz
- Faculty of Medicine, Department of Obstetrics and Gynecology, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel (Drs Hochler and Lipschuetz)
| | - Ari Weiss
- Department of Obstetrics and Gynecology, Shaare Zedek Medical Center, affiliated with the Hebrew University School of Medicine, Jerusalem, Israel (Drs Peled, Nun, Sela, Weiss, Grisaru-Granovsky, and Rottenstreich)
| | - Sorina Grisaru-Granovsky
- Department of Obstetrics and Gynecology, Shaare Zedek Medical Center, affiliated with the Hebrew University School of Medicine, Jerusalem, Israel (Drs Peled, Nun, Sela, Weiss, Grisaru-Granovsky, and Rottenstreich)
| | - Misgav Rottenstreich
- Department of Obstetrics and Gynecology, Shaare Zedek Medical Center, affiliated with the Hebrew University School of Medicine, Jerusalem, Israel (Drs Peled, Nun, Sela, Weiss, Grisaru-Granovsky, and Rottenstreich); Department of Nursing, Jerusalem College of Technology, Jerusalem, Israel (Dr Rottenstreich)
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Abstract
Recurrent pregnancy loss is a distressing pregnancy disorder experienced by ~2.5% of women trying to conceive. Recurrent pregnancy loss is defined as the failure of two or more clinically recognized pregnancies before 20-24 weeks of gestation and includes embryonic and fetal losses. The diagnosis of an early pregnancy loss is relatively straightforward, although progress in predicting and preventing recurrent pregnancy loss has been hampered by a lack of standardized definitions, the uncertainties surrounding the pathogenesis and the highly variable clinical presentation. The prognosis for couples with recurrent pregnancy loss is generally good, although the likelihood of a successful pregnancy depends on maternal age and the number of previous losses. Recurrent pregnancy loss can be caused by chromosomal errors, anatomical uterine defects, autoimmune disorders and endometrial dysfunction. Available treatments target the putative risk factors of pregnancy loss, although the effectiveness of many medical interventions is controversial. Regardless of the underlying aetiology, couples require accurate information on their chances of having a baby and appropriate support should be offered to reduce the psychological burden associated with multiple miscarriages. Future research must investigate the pathogenesis of recurrent pregnancy loss and evaluate novel diagnostic tests and treatments in adequately powered clinical trials.
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Yildirim G, Aşicioğlu O, Güngördük K, Turan I, Acar D, Aslan H, Günay T. Subsequent obstetrics outcomes after intrauterine death during the first pregnancy. J Matern Fetal Neonatal Med 2013; 27:1029-32. [DOI: 10.3109/14767058.2013.849687] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ouyang F, Zhang J, Betrán AP, Yang Z, Souza JP, Merialdi M. Recurrence of adverse perinatal outcomes in developing countries. Bull World Health Organ 2013; 91:357-67. [PMID: 23678199 DOI: 10.2471/blt.12.111021] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Revised: 02/04/2013] [Accepted: 02/06/2013] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE To evaluate the risk of recurrence of adverse perinatal outcomes in second pregnancies in developing countries. METHODS Data from the 2004-2008 Global Survey on Maternal and Perinatal Health were used to determine the outcomes of singleton second pregnancies for 61 780 women in 23 developing countries. The mother-infant pairs had been followed up until discharge or for 7 days postpartum. FINDINGS At the end of their second pregnancies, women whose first pregnancy had ended in stillbirth (n = 1261) or been followed by neonatal death (n = 1052) were more likely than women who had not experienced either outcome to have given birth to a child with a birth weight of < 1500 g (odds ratio, OR: 2.52 and 2.78, respectively) or 1500-2499 g (OR: 1.22 and 1.60, respectively), or to an infant requiring admission to an intensive care unit (OR: 1.64 and 1.68, respectively). At the end of their second pregnancies, those whose first pregnancy had ended in a stillbirth were at increased risk of another stillbirth (OR: 2.35) and those whose first infant had died as a neonate were at increased risk of having the second infant die within the first 7 days of life (OR: 2.82). These trends were found to be largely unaffected by the continent in which the women lived. CONCLUSION In the developing world, a woman whose first pregnancy ends in stillbirth or is followed by the death of the neonate is at increased risk of experiencing the same outcomes in her second pregnancy.
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Affiliation(s)
- Fengxiu Ouyang
- MOE-Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine and School of Public Health, Shanghai, 200092, China
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Thorp JM. Public Health Impact of Legal Termination of Pregnancy in the US: 40 Years Later. SCIENTIFICA 2012; 2012:980812. [PMID: 24278765 PMCID: PMC3820464 DOI: 10.6064/2012/980812] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 10/15/2012] [Indexed: 06/02/2023]
Abstract
During the 40 years since the US Supreme Court decision in Doe versus Wade and Doe versus Bolton, restrictions on termination of pregnancy (TOP) were overturned nationwide. The use of TOP was much wider than predicted and a substantial fraction of reproductive age women in the U.S. have had one or more TOPs and that widespread uptake makes the downstream impact of any possible harms have broad public health implications. While short-term harms do not appear to be excessive, from a public perspective longer term harm is conceiving, and clearly more study of particular relevance concerns the associations of TOP with subsequent preterm birth and mental health problems. Clearly more research is needed to quantify the magnitude of risk and accurately inform women with the crisis of unintended pregnancy considering TOP. The current US data-gathering mechanisms are inadequate for this important task.
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Affiliation(s)
- John M. Thorp
- Department of Obstetrics and Gynecology, School of Medicine, University of North Carolina, Chapel Hill, NC 27599, USA
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Shah PS, Zao J. Induced termination of pregnancy and low birthweight and preterm birth: a systematic review and meta-analyses. BJOG 2009; 116:1425-42. [DOI: 10.1111/j.1471-0528.2009.02278.x] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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van Oppenraaij R, Jauniaux E, Christiansen O, Horcajadas J, Farquharson R, Exalto N. Predicting adverse obstetric outcome after early pregnancy events and complications: a review. Hum Reprod Update 2009; 15:409-21. [DOI: 10.1093/humupd/dmp009] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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10
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Black M, Shetty A, Bhattacharya S. Obstetric outcomes subsequent to intrauterine death in the first pregnancy. BJOG 2007; 115:269-74. [DOI: 10.1111/j.1471-0528.2007.01562.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Parazzini F, Cipriani S, Chiaffarino F, Sandretti F, Bortolus R, Chiantera V. Induced abortion and risk of small-for-gestational-age birth. BJOG 2007; 114:1414-8. [PMID: 17803719 DOI: 10.1111/j.1471-0528.2007.01226.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To investigate the possibility of an association between previous induced abortion and subsequent birth of a small-for-gestational-age (SGA) infant. DESIGN Case-control study. SETTING General and university hospitals. METHODS Cases were 555 women who delivered SGA babies. Controls were 1966 women who gave birth at term (>37 weeks of gestation) to healthy infants of normal weight on randomly selected days at the hospital where cases had been identified. All women in the case and control categories were interviewed on the obstetric wards by one of a team of six interviewers. During the interviews, information was obtained regarding general socio-demographic factors, personal characteristics and habits, gynaecological and obstetric history, general anamnesis, family history of obstetric and gynaecological diseases, and the age of the father of the child. Further information on current pregnancy and delivery was also collected. We used conditional multiple logistic regression (with age as the matching variable), with maximum likelihood fitting, to obtain odds ratios and their corresponding 95% CIs. Included in the regression equations were terms for education, plus terms significantly associated in this data set with the risk of SGA birth (smoking in pregnancy, history of SGA, gestational hypertension and parity). POPULATION Women admitted to a general and a university hospital. RESULTS No significant increase in the risk of SGA birth was observed in women with a previous induced abortion [odds ratio (OR) 1.0; 95% CI 0.6-1.7]. The OR for SGA birth was 1.2 (95% CI 0.7-2.1) for preterm and 1.0 (95% CI 0.7-1.4) for term SGA births. CONCLUSION This study found no association between risk of SGA birth and induced abortion.
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Affiliation(s)
- F Parazzini
- Seconda Clinica Ostetrico Ginecologica, Università di Milano, Fondazione Policlinico, Mangiagalli Regina Elena, Milano, Italy.
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van Eijk AM, De Cock KM, Ayisi JG, Rosen DH, Otieno JA, Nahlen BL, Steketee RW. Pregnancy interval and delivery outcome among HIV-seropositive and HIV-seronegative women in Kisumu, Kenya. Trop Med Int Health 2004; 9:15-24. [PMID: 14728603 DOI: 10.1046/j.1365-3156.2003.01165.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE A short pregnancy interval (PI) has been associated with increased child mortality, but mechanisms are unclear. We studied factors associated with PI and the effect of PI on birthweight and haemoglobin. METHODS Information was analysed from 2218 multigravidae who were recruited at the prenatal clinic (1758) or in the labour ward (460) of the Provincial Hospital in Kisumu between June 1996 and July 2000 for a study to assess the interaction between placental malaria and vertical HIV transmission. RESULTS The HIV prevalence was 28.9%. HIV seropositivity, older age, being unmarried, and <8 years of education were associated with a prolonged PI; among all women, a stillbirth, abortion, or death of a liveborn child as outcome of the previous pregnancy, and death of a child other than the last born among HIV-seronegative women, were associated with a shortened PI. No significant effect of short PI (an interval <24 months) on low birth weight (LBW), prematurity, small-for-gestational-age infants or maternal anaemia was evident. An abortion, stillbirth, or death of a liveborn child as outcome of the previous pregnancy was associated at the present delivery with LBW among HIV-seronegative women [adjusted odds ratio (AOR) 3.33, 95% confidence interval (CI) 1.63-6.81], and a low haemoglobin (<11 g/dl) among HIV-seropositive women (AOR 2.01, 95% CI 1.05-4.03 in the third trimester). CONCLUSION Public health efforts to ensure 'adequate' birth spacing may run contrary to family planning decisions to replace a deceased child and may be spent on prenatal issues like prevention of anaemia, and vertical HIV transmission.
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Zhou W, Sørensen HT, Olsen J. Induced abortion and low birthweight in the following pregnancy. Int J Epidemiol 2000; 29:100-6. [PMID: 10750610 DOI: 10.1093/ije/29.1.100] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND To examine whether induced abortion increases the risk of low birthweight in subsequent singleton live births. METHODS Cohort study using the Danish Medical Birth Registry (MBR), the Hospital Discharge Registry (HDR), and the Induced Abortion Registry (IAR). All women who had their first pregnancy during 1980-1982 were identified in the MBR, the HDR, and the IAR. We included all 15,727 women whose pregnancy was terminated by a first trimester induced abortion in the induced abortion cohort and 46,026 women whose pregnancy was not terminated by an induced abortion were selected for the control cohort. All subsequent pregnancies until 1994 were identified by register record linkage. RESULTS Low birthweight (<2500 g) in singleton term live births occurred more frequently in women with one, two, three or more previous induced abortions, compared with women without any previous induced abortion of similar gravidity, 2.2% versus 1.5%, 2.4% versus 1.7%, and 1.8% versus 1.6%, respectively. Adjusting for maternal age and residence at time of pregnancy, interpregnancy interval, gender of newborn, number of previous spontaneous abortions and number of previous low birthweight infants (control cohort only), the odds ratios (OR) of low birthweight in singleton term live births in women with one, two or more previous first trimester induced abortions were 1.9 (95% CI: 1.6, 2.3), and 1.9 (95% CI: 1.3, 2.7), respectively, compared with the control cohort of similar gravidity. High risks were mainly seen in women with an interpregnancy interval of more than 6 months. CONCLUSIONS The findings suggest a positive association between one or more first trimester induced abortions and the risk of low birthweight in subsequent singleton term live births when the interpregnancy interval is longer than 6 months. This result was unexpected and confounding cannot be ruled out.
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Affiliation(s)
- W Zhou
- The Danish Epidemiology Science Centre, Aarhus University, Denmark
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