Widening social inequalities in risk for sudden infant death syndrome

The global burden of sudden infant death syndrome from 1990 to 2019: a systematic analysis from the Global Burden of Disease study 2019

BACKGROUND

Sudden infant death syndrome (SIDS) still remains one of the leading causes of infant death worldwide, especially in high-income countries. To date, however, there is no detailed information on the global health burden of SIDS.

AIMS

To characterize the global disease burden of SIDS and its trends from 1990 to 2019 and to compare the burden of SIDS according to the socio-demographic index (SDI).

DESIGN

Systematic analysis based on the Global Burden of Disease (GBD) 2019 data.

METHODS

Epidemiological data of 204 countries from 1990 to 2019 were collected via various methods including civil registration and vital statistics in the original GBD study. Estimates for mortality and disease burden of SIDS were modeled. Crude mortality and mortality rates per 100 000 population were analyzed. Disability-adjusted life years (DALYs) and DALY rates were also assessed.

RESULTS

In 2019, mortality rate of SIDS accounted for 20.98 [95% Uncertainty Interval, 9.15-46.16] globally, which was a 51% decrease from 1990. SIDS was most prevalent in Western sub-Saharan Africa, High-income North America and Oceania in 2019. The burden of SIDS was higher in males than females consistently from 1990 to 2019. Higher SDI and income level was associated with lower burden of SIDS; furthermore, countries with higher SDI and income had greater decreases in SIDS burden from 1990 to 2019.

CONCLUSIONS

The burden of SIDS has decreased drastically from 1990 to 2019. However, the improvements have occurred disproportionately between regions and SDI levels. Focused preventive efforts in under-resourced populations are needed.

Infant mortality inequities for Māori in New Zealand: a tale of three policies

Background

The history of infant mortality inequities among Māori in New Zealand provides a remarkable case study for understanding the shortcomings of policy which fails to consider the differential risks associated with disadvantaged groups. Specifically, the failure of the initial 1991 reform in addressing Māori infant health, followed by the relative success of post-1994 policy, demonstrate that disadvantaged populations carry differential social risks which require adjusting policy accordingly. Literature on these policies show that differential risks may include disparities in representation, access to resources, socioeconomic status, and racism. The consideration of differential risks is important in analyzing the underlying causes of inequities and social policy deficiencies.

Aim

To describe and illustrate the need for policy addressing inequities to consider the differential risks associated with disadvantaged groups through an analysis of New Zealand’s Māori infant mortality policy progression.

Methods

The article is a commentary on a series of policies aimed at reducing infant mortality in New Zealand. It analyses three policies and how their differences are linked to the corresponding trends in equity between Māori and non-Māori populations.

Findings

The progression of Māori infant mortality policy clearly demonstrates that equitable social policy must be culturally sensitive and inclusive towards disadvantaged groups, as well as willing to adapt to changing circumstances and shortcomings of current policy. Prior to 1994, health policy which did not account for the differential risks of Māori populations caused inequities in infant mortality to increase, despite infant mortality decreasing on a national level. After policy was adjusted to account for Māori-specific risks in 1994, infant mortality inequities significantly declined. A comprehensive analysis of these policies shows that the consideration of differential risks is highly related to a decrease in corresponding inequities.

Conclusions

As New Zealand, and other countries facing inequities such as the United States and Australia, move forward in constructing policy, they would do well to consider the lessons of how New Zealand policy changed the frequency of infant mortality in Māori populations. The study shows that the consideration of differential risks associated with disadvantaged groups is necessary for policy to successfully address inequities.

Structural racism, socio-economic marginalization, and infant mortality

OBJECTIVES

We examine associations between infant mortality rates (IMRs) and measures of structural racism and socio-economic marginalization in Chicago, Illinois. Our purpose was to determine whether the Index of Concentration at the Extremes (ICE) was significantly related to community-level IMRs.

STUDY DESIGN

We use a cross-sectional ecological public health design to examine community-level factors related to IMRs in Chicago neighborhoods.

METHODS

We use data from the Chicago Department of Public Health and the American Community Survey to examine IMR inequities during the period 2012-2016. Calculations of the ICE for race and income were undertaken. In addition, we calculated racialized socio-economic status, which is the concentration of affluent Whites relative to poor Blacks in a community area. We present these ICE measures, as well as hardship, percent of births with inadequate prenatal care (PNC), and the percent of single-parent households as quintiles so that we can compare neighborhoods with the most disadvantage with neighborhoods with the least. Negative binomial regression was used to determine whether the ICE measures were independently related to community IMRs, net of hardship scores, PNC, and single-parent households.

RESULTS

Spearman correlation results indicate significant associations in Chicago communities between measures of racial segregation and economic marginalization and IMRs. Community areas with the lowest ICE_Race scores (those with the largest concentrations of Black residents, compared with White) had IMRs that were 3.63 times higher than those communities with the largest concentrations of White residents. Most associations between community IMRS and measures of structural racism and socioeconomic marginalization are accounted for in fully adjusted negative binomial regression models. Only ICERace remained significantly related to IMRs.

CONCLUSIONS

We show that structural racism as represented by the ICE is independently related to IMRs in Chicago; community areas with the largest concentrations of Blacks residents compared with Whites are those with the highest IMRs. This relationship persists even after controlling for socio-economic marginalization, hardship, household composition/family support, and healthcare access. Interventions to improve birth outcomes must address structural determinants of health inequities.

Applying a Social Exclusion Framework to Explore the Relationship Between Sudden Unexpected Deaths in Infancy (SUDI) and Social Vulnerability

Background: Sudden Unexpected Death in Infancy (SUDI) is a leading cause of preventable infant mortality and strongly associated with social adversity. While this has been noted over many decades, most previous studies have used single economic markers in social disadvantage analyses. To date there have been no previous attempts to analyze the cumulative effect of multiple adversities in combination on SUDI risk.

Methods: Based on sociological theories of social exclusion, a multidimensional framework capable of producing an overall measure of family-level social vulnerability was developed, accounting for both increasing disadvantage with increasing prevalence among family members and effect of family structures. This framework was applied retrospectively to all cases of SUDI that occurred in Queensland between 2010 and 2014. Additionally, an exploratory factor analysis was performed to investigate whether differing “types” of vulnerability could be identified.

Results: Increased family vulnerability was associated with four major known risk factors for sudden infant death: smoking, surface sharing, not-breastfeeding and use of excess bedding. However, families with lower levels of social vulnerability were more likely to display two major risk factors: prone infant sleep position and not room-sharing. There was a significant positive relationship between family vulnerability and the cumulative total of risk factors. Exploratory factor analysis identified three distinct vulnerability types (chaotic lifestyle, socioeconomic and psychosocial); the first two were associated with presence of major SUDI risk factors. Indigenous infants had significantly higher family vulnerability scores than non-Indigenous families.

Conclusion: A multidimensional measure that captures adversity across a range of indicators highlights the need for proportionate universalism to reduce the stalled rates of sudden infant death. In addition to information campaigns continuing to promote the importance of the back-sleeping position and close infant-caregiver proximity, socially vulnerable families should be a priority population for individually tailored or community based multi-model approaches.

Three decades of inequality in neonatal and early childhood mortality in singleton births in Scotland

Background

Socioeconomic inequality in child mortality highlights opportunities for policies to reduce child deaths.

Methods

We used singleton birth, death and maternity records from Scotland, 1981-2011, to examine mortality rate differences by age across deprivation quintiles over time. We measured the difference between the most and least deprived quintiles (Q5-Q1) and the slope index of inequality (SII) across all quintiles-measures of the absolute deprivation gap, providing an indication of the public health impact.

Results

Q5-Q1 remained relatively constant from 1990 onwards for early neonates, widened in the mid-2000s for late neonates, increased in the 1990 s then decreased in the 2000 s in the post-neonates and declined over time in early childhood. The trend over time in SII showed no significant change for early neonates (P = 0.440), significant decrease for post-neonates (P = 0.010) and early childhood (P = 0.043), and significant increase for late neonates (P = 0.011).

Conclusions

Over three decades, the absolute deprivation gap in mortality widened in late neonates but stabilized or declined at other ages. This may reflect improved survival beyond the early neonatal period of babies with conditions related to socioeconomic inequality such as prematurity. Monitoring birth cohort data could enhance understanding of this vulnerable group.

Socioeconomic inequalities in childhood-to-adulthood BMI tracking in three British birth cohorts

BACKGROUND

Body mass index (BMI) tracks from childhood-to-adulthood, but the extent to which this relationship varies across the distribution and according to socio-economic position (SEP) is unknown. We aimed to address this using data from three British cohort studies.

METHODS

We used data from: 1946 National Survey of Health and Development (NSHD, n = 2470); 1958 National Child Development Study (NCDS, n = 7747); 1970 British Cohort Study (BCS, n = 5323). BMI tracking between 11 and 42 years was estimated using quantile regression, with estimates reflecting correlation coefficients. SEP disparities in tracking were investigated using a derived SEP variable based on parental education reported in childhood. This SEP variable was then interacted with the 11-year BMI z-score.

RESULTS

In each cohort and sex, tracking was stronger at the upper end of the distribution of BMI at 42 years. For example, for men in the 1946 NSHD, the tracking estimate at the 10th quantile was 0.31 (0.20, 0.41), increasing to 0.71 (0.61, 0.82) at the 90th quantile. We observed no strong evidence of SEP inequalities in tracking in men in the 1946 and 1958 cohorts. In the 1970 cohort, however, we observed tentative evidence of stronger tracking in low SEP groups, particularly in women and at the higher end of the BMI distribution. For example, women in the 1970 cohort from low SEP backgrounds had tracking coefficients at the 50th, 70th, and 90th quantiles, which were 0.05 (-0.04; 0.15), 0.19 (0.06; 0.31), and 0.22 (0.02; 0.43) units higher, respectively, than children from high SEP groups.

CONCLUSION

Tracking was consistently stronger at the higher quantiles of the BMI distribution. We observed suggestive evidence for a pattern of greater BMI tracking in lower (compared to higher) SEP groups in the more recently born cohort, particularly in women and at the higher end of the BMI distribution.

Safe Sleep Practices of Kansas Birthing Hospitals

BACKGROUND

Sleep-related death is tied with congenital anomalies as the leading cause of infant mortality in Kansas, and external risk factors are present in 83% of these deaths. Hospitals can impact caregiver intentions to follow risk-reduction strategies. This project assessed the current practices and policies of Kansas hospitals with regard to safe sleep.

METHODS

A cross-sectional survey of existing safe sleep practices and policies in Kansas hospitals was performed. Hospitals were categorized based on reported delivery volume and data were compared across hospital sizes.

RESULTS

Thirty-one of 73 (42%) contacted hospitals responded. Individual survey respondents represented various hospital departments including newborn/well-baby (68%), neonatal intensive care unit (3%) and other non-nursery departments or administration (29%). Fifty-eight percent of respondents reported staff were trained on infant safe sleep; 44% of these held trainings annually. High volume hospitals tended to have more annual training than low or mid volume birth hospitals. Thirty-nine percent reported a safe sleep policy, though most of these (67%) reported never auditing compliance. The top barrier to safe sleep education, regardless of delivery volume, was conflicting patient and family member beliefs.

CONCLUSIONS

Hospital promotion of infant safe sleep is being conducted in Kansas to varying degrees. High and mid volume birth hospitals may need to work more on formal auditing of safe sleep practices, while low volume hospitals may need more staff training. Low volume hospitals also may benefit from access to additional caregiver education materials. Finally, it is important to note hospitals should not be solely responsible for safe sleep education.

Is it Time for a Sudden Infant Death Syndrome (SIDS) Awareness Campaign? Community Stakeholders' Perceptions of SIDS

Background

Sudden infant death syndrome (SIDS) remains a leading cause of infant death in the United States and in Virginia, the SIDS rate is higher than the national average. We sought to gauge the perceptions among community-identified stakeholders as to community resource needs to reduce SIDS.

Methods

We used snowball sampling to identify important community stakeholders to be interviewed as key informants. A semi-structured interview lasting 45 min-2 hours was delivered to determine resource needs to reduce SIDS, and whether high-risk community members were aware of SIDS risk factors among stakeholders representing a variety of disciplines. Interviews were conducted in two geographic areas with higher than average rates of infant mortality, an urban district, Winchester City, VA and a rural district, Page County, VA.

Results

A total of 74 interviews were completed with stakeholders in healthcare, health departments, social services, law enforcement, education/childcare, faith-based institutions, non-profit agencies and non-affiliated community members. The majority of respondents perceive that high-risk community members are not aware of factors that can lead to SIDS (50%). Participants suggested that more "education" is needed to further reduce the rates of SIDS in their communities (73%). Respondents detailed that more pervasive, strategic, and multi-channeled education is necessary to reduce cases of SIDS.

Conclusion

Community leaders perceive that high-risk community members are not fully aware of risk factors that can lead to SIDS. Maternal/child health stakeholders in these Virginia locales suggested more community-based education as a potential solution to SIDS.

New Frameworks for Understanding Sudden Unexpected Deaths in Infancy (SUDI) in Socially Vulnerable Families

THEORETICAL PRINCIPLES

Sociological frameworks may enhance understanding of the complex and multidimensional nature of disadvantage, which is prevalent among families who experience Sudden Unexpected Death in Infancy (SUDI).

PHENOMENA ADDRESSED

SUDI is the largest category of postneonatal death and largely associated with the social determinants of health. The highly successful 'Back to Sleep' campaign has resulted in a more than 85% decrease in SUDI. However, social inequalities have accompanied this decrease, and the burden of SUDI now lies with the most disadvantaged and socially vulnerable families. A considerable body of research on the phenomena of SUDI and disadvantage has been published over the last decade, demonstrating the widening social gradient in SUDI, and the importance in recognising structural factors and the multifactorial nature of disadvantage. Gaps in understanding of risk factors and scepticism about the received wisdom of health professionals have emerged as central themes in understanding why socially vulnerable families may adopt unsafe infant care practices. The direct impact of social disadvantage on infant care has also been recognised.

RESEARCH LINKAGES

The translation of epidemiological findings regarding SUDI risk into public health recommendations for health professionals and families alike has to date focused on eliminating individual level risk behaviours. Unfortunately, such a model largely ignores the broader social, cultural, and structural contexts in which such behaviours occur. Translating the new knowledge offered by sociological frameworks and the principles of behavioural economics into evidence based interventions may assist in the reduction of SUDI mortality in our most socially vulnerable families.

Does involvement in a cohort study improve health and affect health inequalities? A natural experiment

BACKGROUND

Evidence suggests that the process of taking part in health research can improve participants' health, independent of any intended intervention. However, no research has yet explored whether these effects differ across socioeconomic groups. If the effect of mere participation in health research also has a social gradient this could increase health inequalities and bias research results. This study used the Born in Bradford family cohort (BIB) to explore whether simply taking part in BIB had improved participants' health and, if so, whether this effect was mediated by socioeconomic status.

METHODS

Survey data on self-reported health behaviours were collected between 2007 and 2010 as part of BIB. These were augmented by clinical data on birth weight. Pregnant women on their second pregnancy, joining BIB for the first time formed the control group. Their health was compared to women on their second pregnancy who had both pregnancies within the study, who formed the exposed group. In order to limit the inherent bias in a non-randomised study, propensity score analysis was used, matching on age, ethnicity, education and date of questionnaire. The results were then compared according to mothers' education.

RESULTS

Of six outcomes tested, only alcohol consumption showed a statistically significant reduction with exposure to BIB (OR: 0.35, 95% CIs 0.13, 0.92). Although effect estimates were larger for women with higher education compared to lower education, these effects were not statistically significant.

CONCLUSIONS

Despite one significant finding, these results overall are insufficient to conclude that simply taking part in BIB affected participants' health. We recommend that socioeconomic status is considered in future studies testing effects of research participation, and that randomised studies with larger sample sizes are conducted.

Perinatal Disparities Between American Indians and Alaska Natives and Other US Populations: Comparative Changes in Fetal and First Day Mortality, 1995-2008

To compare fetal and first day outcomes of American Indian and Alaskan Natives (AIAN) with non-AIAN populations. Singleton deliveries to AIAN and non-AIAN populations were selected from live birth-infant death cohort and fetal deaths files from 1995-1998 and 2005-2008. We examined changes over time in maternal characteristics of deliveries and disparities and changes in risks of fetal, first day (<24 h), and cause-specific deaths. We calculated descriptive statistics, odds ratios and confidence intervals, and ratio of odds ratios (RORs) to indicate changes in disparities. Along with black mothers, AIANs exhibited the highest proportion of risk factors including the highest proportion of diabetes in both time periods (4.6 and 6.5 %). Over time, late fetal death for AIANs decreased 17 % (aOR = 0.83, 95 % CI 0.72-0.97), but we noted a 47 % increased risk over time for Hispanics (aOR = 1.47, 95 % CI 1.40-1.55). Our data indicated no change over time among AIANs for first day death. For AIANs compared to whites, increased risks and disparities persisted for mortality due to congenital anomalies (ROR = 1.28, 95 % CI 1.03-1.60). For blacks compared to AIANs, the increased risks of fetal death (2005-2008: aOR = 0.60, 95 % CI 0.53-0.68) persisted. For Hispanics, lower risks compared to AIANs persisted, but protective effect declined over time. Disparities between AIAN and other groups persist, but there is variability by race/ethnicity in improvement of perinatal outcomes over time. Variability in access to care and pregnancy management should be considered in relation to health equity for fetal and early infant deaths.

Disparities in Maternal Child and Health Outcomes Attributable to Prenatal Tobacco Use

OBJECTIVES

Previous estimates of smoking-attributable adverse outcomes, such as preterm births (PTBs), low birth weight (LBW) and Sudden Infant Death Syndrome (SIDs) generally do not address disparities by maternal age, racial/ethnic group or socioeconomic status (SES). This study develops estimates of smoking-attributable PTB, LBW and SIDS for the US by age, SES and racial/ethnic groupings.

METHODS

Data on the number of births and the prevalence of PTB, LBW and SIDS were used to develop the number of outcomes by age, race/ethnicity, and SES. The prevalence of prenatal smoking by age, race/ethnic and education and the relative risk of outcomes for smokers were used to calculate smoking-attributable fractions of outcomes.

RESULTS

Prenatal smoking among ages 15-24 is above 12 %, with 20-24 year olds representing at least 35 % of PTB, LBW SIDS cases. Women with a high school education or less represented more than 50 % of PTB and LBW births, and 44 % of SIDS cases. While non-Hispanic Whites had the majority of smoking-attributable outcomes, non-Hispanic Blacks represented a disproportionately high percentage of PTBs (18 %), LBW births (22 %), and SIDS cases (13 %).

CONCLUSIONS

Reducing prenatal smoking has the potential to reduce adverse birth outcomes and costs with long-term implications, especially among the young, non-Hispanic Blacks and those of lower SES. Stricter tobacco control policies, especially higher cigarette taxes, higher minimum purchase ages for tobacco and improved cessation interventions can help reduce disparities and the cost to insurers, especially public costs through Medicaid.

Interventions to Improve Safe Sleep Among Hospitalized Infants at Eight Children's Hospitals

BACKGROUND AND OBJECTIVES

Within hospital pediatric units, there is a lack of consistent application or modeling of the American Academy of Pediatrics recommendations for safe infant sleep. The purpose of this study was to improve safe sleep practices for infants in nonneonatal pediatric units with implementation of specific interventions.

METHODS

This multi-institutional study was conducted by using baseline observations collected for sleep location, position, and environment (collectively, "safe sleep") of infants admitted to pediatric units. Interventions consisted of: (1) staff education, including a commitment to promote safe sleep; (2) implementing site-generated safe sleep policies; (3) designating supply storage in patient rooms; and/or (4) caregiver education. Postintervention observations of safe sleep were collected. Eight hospitals participated from the Inpatient FOCUS Group of the Children's Hospital Association. Each site received institutional review board approval/exemption.

RESULTS

Safe sleep was observed for 4.9% of 264 infants at baseline and 31.2% of 234 infants postintervention (P<.001). Extra blankets, the most common of unsafe items, were present in 77% of cribs at baseline and 44% postintervention. However, the mean number of unsafe items observed in each sleeping environment was reduced by >50% (P=.001).

CONCLUSIONS

Implementation of site-specific interventions seems to improve overall safe sleep in inpatient pediatric units, although continued improvement is needed. Specifically, extra items are persistently left in the sleeping environment. Moving forward, hospitals should evaluate their compliance with American Academy of Pediatrics recommendations and embrace initiatives to improve modeling of safe sleep.

[The racialization of public health in the United States : the possibility that the concept be allowed to die out]

Résumé

Aux États-Unis, une intensification de l’usage de la race en santé publique a récemment été notée ; une idée qui est pourtant controversée dans les sciences. La race a été vue dans ce contexte comme un objet de discours entre pouvoirs et savoirs, un objet qui se réfère au corps devenu au cours des derniers siècles un site discursif pour représenter la différence. Cet article s’appuie sur une analyse de documents de la santé publique parus aux États-Unis et issus de bureaux fédéraux et d’une importante revue spécialisée dans le domaine sanitaire, qui ont été publiés entre 2001 et 2009. Cette étude a analysé la manière dont la race est représentée, produite comme objet de connaissance et régulée par les pratiques discursives dans ces documents. Les résultats décrivent deux processus enchevêtrés, la racialisation et la sanitarisation, qui concourent à reformuler l’idée de race. Le premier est un ensemble d’opérations qui visent à identifier, à situer et à opposer les sujets et les groupes à partir de labels standardisés. La sanitarisation assure la traduction des groupes racialisés en termes de maladies, de comportements, de vie ou de mort. Ces pratiques aboutissent à la caractérisation et à la formation d’objets racialisés et sanitarisés et à des stéréotypes ; un ensemble d’opérations qui a tendance à naturaliser la différence. La racialisation apparaît également tiraillée entre un pouvoir sur la vie et un droit de laisser mourir. Enfin, cette étude propose aux acteurs de la santé publique de sortir des frontières imposées par le discours racialisant.

What new mothers need to know: perspectives from women and providers in Georgia

Identifying the educational and resource needs of new mothers is of paramount importance in developing programs to improve maternal and child health outcomes. The primary purpose of this study was to explore the educational needs of new mothers and identify opportunities to enhance healthcare providers' current educational efforts. A two-part methodology was utilized to qualitatively explore the topic of parenting information needs for new mothers in Georgia. Data collection included information from 11 focus groups with 92 first-time, new mothers and 20 interviews with healthcare providers who serve new mothers. Discussions with both new mothers and providers clearly indicated that new mothers face a significant informational deficit, especially regarding very basic, daily infant care information and health literacy challenges. Educational materials already exist; however, mothers report difficulty accessing and understanding this information. For this reason, both the mothers and the providers stressed a focus on developing programs or interventions that allow in-person education and/or alternative modalities to access information, as opposed to development of new written materials solely. Information from the focus group and interviews provided important insight regarding what improvements need to be made to help new mothers and their families during the early stages of parenthood. By improving the education of new mothers and their families, it is proposed that maternal and infant health status could be improved.

Using surveillance data to inform a SUID reduction strategy in Massachusetts

BACKGROUND

Non-supine infant sleep positions put infants at risk for sudden unexpected infant death (SUID). Disparities in safe sleep practices are associated with maternal income and race/ethnicity. The Special Supplemental Nutrition Program for Women, Infants and Children (WIC) is a nutrition supplement program for low-income (≤185% Federal Poverty Level) pregnant and postpartum women. Currently in Massachusetts, approximately 40% of pregnant/postpartum women are WIC clients. To inform the development of a SUID intervention strategy, the Massachusetts Department of Public Health (MDPH) investigated the association between WIC status and infant safe sleep practices among postpartum Massachusetts mothers using data from the Pregnancy Risk Assessment Monitoring System (PRAMS) survey.

METHODS

PRAMS is an ongoing statewide health surveillance system of new mothers conducted by the MDPH in collaboration with the Centers for Disease Control and Prevention (CDC). PRAMS includes questions about infant sleep position and mothers' prenatal WIC status. Risk Ratio (RR) and 95 percent confidence intervals (CI) were calculated for infant supine sleep positioning by WIC enrollment, yearly and in aggregate (2007-2010).

RESULTS/OUTCOMES

The aggregate (2007-2010) weighted sample included 276,252 women (weighted n ≈ 69,063 women/year; mean survey response rate 69%). Compared to non-WIC mothers, WIC mothers were less likely to usually or always place their infants in supine sleeping positions [RR = 0.81 (95% CI: 0.80, 0.81)]. Overall, significant differences were found for each year (2007, 2008, 2009, 2010), and in aggregate (2007-2010) by WIC status.

CONCLUSION

Massachusetts WIC mothers more frequently placed their babies in non-supine positions than non-WIC mothers. While this relationship likely reflects the demographic factors associated with safe sleep practices (e.g., maternal income and race/ethnicity), the finding informed the deployment of an intervention strategy for SUID prevention. Given WIC's statewide infrastructure and the large proportion of pregnant/postpartum women in Massachusetts that are enrolled in WIC, a WIC-based safe sleep intervention may be an effective SUID reduction strategy with potential national application.

Methodology and recruitment for a randomised controlled trial to evaluate the safety of wahakura for infant bedsharing

BACKGROUND

Sudden Unexpected Death in Infancy (SUDI) has persistent high rates in deprived indigenous communities and much of this mortality is attributable to unsafe sleep environments. Whilst health promotion worldwide has concentrated on avoidance of bedsharing, the indigenous Māori community in New Zealand has reproduced a traditional flax bassinet (wahakura) designed to be used in ways that include bedsharing. To date there has been no assessment of the safety of this traditional sleeping device.

METHODS/DESIGN

This two arm randomised controlled trial is being conducted with 200 mother-baby dyads recruited from Māori communities in areas of high deprivation in the Hawkes Bay, New Zealand. They are randomised to wahakura or bassinet use and investigation includes questionnaires at baseline (pregnancy), when baby is 1, 3, and 6 months, and an overnight video sleep study at 1 month with monitoring of baby temperature and oxygen saturation, and measurement of baby urinary cotinine and maternal salivary oxytocin. Outcome measures are amount of time head covered, amount of time in thermal comfort zone, number of hypoxic events, amount of time in the assigned sleep device, amount of time breastfeeding, number of parental (non-feed related) touching infant events, amount of time in the prone sleep position, the number of behavioural arousals and the amount of time infant is awake overnight. Survey data will compare breastfeeding patterns at 1, 3, and 6 months as well as data on maternal mind-mindedness, maternal wellbeing, attachment to baby, and maternal sleep patterns.

DISCUSSION

Indigenous communities require creative SUDI interventions that fit within their prevailing world view. This trial, and its assessment of the safety of a wahakura relative to a standard bassinet, is an important contribution to the range of SUDI prevention research being undertaken worldwide.

TRIALS REGISTRATION

Australian New Zealand Clinical Trials Registry: ACTRN12610000993099 Registered 16th November 2010.

Understanding why children die in high-income countries

Many factors affect child and adolescent mortality in high-income countries. These factors can be conceptualised within four domains-intrinsic (biological and psychological) factors, the physical environment, the social environment, and service delivery. The most prominent factors are socioeconomic gradients, although the mechanisms through which they exert their effects are complex, affect all four domains, and are often poorly understood. Although some contributing factors are relatively fixed--including a child's sex, age, ethnic origin, and genetics, some parental characteristics, and environmental conditions--others might be amenable to interventions that could lessen risks and help to prevent future child deaths. We give several examples of health service features that could affect child survival, along with interventions, such as changes to the physical or social environment, which could affect upstream (distal) factors.

Trends in racial and ethnic disparities in infant mortality rates in the United States, 1989-2006

OBJECTIVES

We sought to measure overall disparities in pregnancy outcome, incorporating data from the many race and ethnic groups that compose the US population, to improve understanding of how disparities may have changed over time.

METHODS

We used Birth Cohort Linked Birth-Infant Death Data Files from US Vital Statistics from 1989-1990 and 2005-2006 to examine multigroup indices of racial and ethnic disparities in the overall infant mortality rate (IMR), preterm birth rate, and gestational age-specific IMRs. We calculated selected absolute and relative multigroup disparity metrics weighting subgroups equally and by population size.

RESULTS

Overall IMR decreased on the absolute scale, but increased on the population-weighted relative scale. Disparities in the preterm birth rate decreased on both the absolute and relative scales, and across equally weighted and population-weighted indices. Disparities in preterm IMR increased on both the absolute and relative scales.

CONCLUSIONS

Infant mortality is a common bellwether of general and maternal and child health. Despite significant decreases in disparities in the preterm birth rate, relative disparities in overall and preterm IMRs increased significantly over the past 20 years.

Sudden infant death syndrome in an urban Aboriginal community

AIM

The study aims to understand sudden infant death syndrome (SIDS) risk and preventive practices in an urban Aboriginal community, through exploration of mothers' knowledge and practices and examination of coroner case records.

METHODS

Data were collected from the mothers of Aboriginal infants participating in the Gudaga Study, a longitudinal birth cohort study. At 2-3 weeks post-natal, mothers were asked about SIDS risk-reduction practices, infant sleeping position and smoking practices within the home. Questions were repeated when study infants were 6 months of age. During the first 18 months of the study, three infants within the cohort died. All deaths were identified as SIDS related. The Coroner reports for these infants were reviewed.

RESULTS

At the 2-3 weeks data collection point, approximately 66.2% (n = 98) of mothers correctly identified two or more SIDS risk-reduction strategies. At this same data point, approximately 82% (n = 122) of mothers were putting their infants to sleep on their backs (supine). Higher maternal education was significantly associated (P < 0.01), with identification of two or more correct SIDS risk-reduction strategies and supine sleeping position at 2-3 weeks. The Coroner considered two infants who had been sleeping in an unsafe sleeping environment.

CONCLUSION

Rates of SIDS deaths within the study community were much higher than the national average. Most mothers were putting their infant to sleep correctly even though they may be unaware that their practice was in accordance with recommended guidelines. Best practice safe sleeping environments are difficult to achieve for some families living in low socio-economic settings.

Black-white differences in maternal age, maternal birth cohort, and period effects on infant mortality in the US (1983-2002)

We investigate three interrelated sources of change in infant mortality rates over a 20year period using the National Center for Health Statistics (NCHS) linked birth and infant death cohort files. The effects of maternal age, maternal birth cohort, and time period of childbirth on infant mortality are estimated using a modified age/period/cohort (APC) model that identifies age, period, cohort effects. We document black-white differences in the patterning of these effects and find that maternal age effects follow the predictable U-shaped pattern, net of period and cohort, but with a less steep gradient in the black population. The largest relative maternal age-specific disparity in IMR occurs among older African American mothers. Cohort effects, while considerably smaller than age and period effects, present an interesting pattern of a modest decline in IMR among later cohorts of African American mothers coupled with an increasing IMR among the same cohorts of non-Hispanic whites. However, period effects dominate the time trends, implying that period-related technologies overwhelmingly shape US infant survival in today's population. These general findings are mirrored in APC analyses carried out for several leading underlying causes of infant mortality.

Maternal smoking and increased risk of sudden infant death syndrome: a meta-analysis

Maternal smoking is detrimental to the development of fetuses and neonates. This meta-analysis was performed to measure the accumulated association of sudden infant death syndrome (SIDS) risk with both prenatal and postnatal maternal smoking. The odds ratio (OR) corresponding to the 95% confidence interval (CI) was used to assess the associations between maternal smoking and SIDS risk. The statistical heterogeneity among studies was assessed with the Q-test and I(2) statistics. The data for this meta-analysis were available from 35 case-control studies. The prenatal and postnatal maternal smoking was associated with a significantly increased risk of SIDS (OR=2.25, 95% CI=2.03-2.50 for prenatal maternal smoking analysis, and OR=1.97, 95% CI=1.77-2.19 for postnatal maternal smoking analysis, respectively) by random effects model. After stratified analyses, regardless of prenatal or postnatal smoking, heavy cigarette consumption increased the risk of SIDS and significantly elevated SIDS risk was found to be associated with co-sleeping with postnatal smoking mothers. Our results suggested that maternal smoking were associated with elevated SIDS risk, the effects were dose-dependent. In addition, SIDS risk was significantly increased in infants co-sleeping with postnatal smoking mothers.

Measuring health disparities: trends in racial-ethnic and socioeconomic disparities in obesity among 2- to 18-year old youth in the United States, 2001-2010

PURPOSE

Although eliminating health disparities by race, ethnicity, and socioeconomic status (SES) is a top public health priority internationally and in the United States, weight-related racial/ethnic and SES disparities persist among adults and children in the United States. Few studies have examined how these disparities have changed over time; these studies are limited by the reliance on rate differences or ratios to measure disparities. We sought to advance existing research by using a set of disparity metrics on both the absolute and relative scales to examine trends in childhood obesity disparities over time.

METHODS

Data from 7066 children, ages 2 to 18 years, in the National Health and Nutrition Examination Surveys were used to explore trends in racial/ethnic and SES disparities in pediatric obesity from 2001 to 2010 using a set of different disparity metrics.

RESULTS

Racial/ethnic and SES-related disparities in pediatric obesity did not change significantly from 2001 to 2010 and remain significant.

CONCLUSIONS

Disparities in obesity have not improved during the past decade. The use of different disparity metrics may lead to different conclusions with respect to how disparities have changed over time, highlighting the need to evaluate disparities using a variety of metrics.

Racial differences in trends and predictors of infant sleep positioning in South Carolina, 1996-2007

This paper examines racial differences in trends and predictors of prone and lateral infant sleep positioning among South Carolina mothers and infants. Pregnancy Risk Assessment Monitoring System data were used to analyze linear trends in prone, lateral, and supine infant sleep positioning among 14,648 mother-infant pairs from 1996 to 2007. Logistic regression models were used to examine the predictors of prone and lateral positioning among 9,015 mother-infant pairs from 2000 to 2007. From 1996 to 2007, white infants experienced a reduction in both prone and lateral positioning and an increase in supine positioning (28.2-66.7%), while black infants had smaller decreases in prone and lateral positioning and a smaller increase in supine positioning (22.6-47.1%) than white infants. Compared to births in 2000-2005, births after the explicit recommendation that infants not be placed in the lateral sleep position (2006-2007) were associated with decreased odds of lateral positioning among white infants (odds ratio [OR]: 0.66; 95% confidence interval [CI]: 0.51, 0.87) but not among black infants. The significant predictors of white infants being placed in the prone position were different from the predictors for black infants. Additionally, with regard to lateral sleep positioning, more significant predictors were observed among white infants than black infants. These findings suggest that efforts are warranted to increase the prevalence of supine sleep positioning, especially among black infants. Race-specific programs may efficiently reduce non-supine sleep positioning to help narrow racial gaps in sudden infant death syndrome.

Maternal marital status and the risk of stillbirth and infant death: a population-based cohort study on 40 million births in the United States

OBJECTIVE

The objective of our study was to evaluate the association between maternal marital status and the risk of fetal and infant death, including sudden infant death syndrome (SIDS).

METHODS

We conducted a population-based cohort study using the Centers for Disease Control and Prevention's Linked Birth-Infant Death and Fetal Death data on all births in the United States between 1995 and 2004. Marital status was obtained from the birth certificate. The adjusted effect of marital status on the risk of fetal and infant mortalities was estimated using unconditional logistic regression analysis.

RESULTS

The cohort consisted of 40,529,306 births, of which 37,461,715 met study criteria. There were 130,353 stillbirths (3.5/1,000 births) and 140,175 infant deaths (3.8/1,000 births), of which 24,066 were due to SIDS (0.6/1,000 births). Rates of nonmarital births increased from 31.3% to 35.4% over the study period. As compared with births from married women, births from unmarried women were at an increased risk of stillbirths (relative rise [RR], 1.24; 95% confidence interval [CI], 1.21-1.26), total infant deaths (RR, 1.45; 95% CI, 1.42-1.47), and SIDS (RR, 1.70; 95% CI, 1.63-1.78). Among unmarried women, those at a higher risk of fetal and infant death were women under 15 or over 40 years of age, African-American women, and those who received no prenatal care.

CONCLUSION

Nonmarital childbearing seems to be associated with an increased risk of fetal and infant death, including SIDS. Promoting access to care and targeting unmarried mothers-to-be with the goal of educating, increasing awareness, and providing resources for proper obstetrical and maternal care may be of great benefit to their pregnancies.

Prenatal Health, Educational Attainment, and Intergenerational Inequality: The Northern Finland Birth Cohort 1966 Study

In this article, we study the effects of prenatal health on educational attainment and on the reproduction of family background inequalities in education. Using Finnish birth cohort data, we analyze several maternal and fetal health variables, many of which have not been featured in the literature on long-term socioeconomic effects of health despite the effects of these variables on birth and short-term health outcomes. We find strong negative effects of mother’s prenatal smoking on educational attainment, which are stronger if the mother smoked heavily but are not significant if she quit during the first trimester. Anemia during pregnancy is also associated with lower levels of attained education. Other indicators of prenatal health (pre-pregnancy obesity, mother’s antenatal depressed mood, hypertension and preeclampsia, early prenatal care visits, premature birth, and small size for gestational age) do not predict educational attainment. Our measures explain little of the educational inequalities by parents’ class or education. However, smoking explains 12%—and all health variables together, 19%—of the lower educational attainment of children born to unmarried mothers. Our findings point to the usefulness of proximate health measures in addition to general ones. They also point to the potentially important role played by early health in intergenerational processes.

Racial and ethnic disparities in infant mortality

Racial and ethnic disparities in infant mortality in the United States seem to defy all attempts at elimination. Despite national priorities to eliminate these disparities, black infants are 2.5 times more likely to die in infancy compared with non-Hispanic white infants. This disparity is largely related to the greater incidence among black infants of prematurity and low birth weight, congenital malformations, sudden infant death syndrome, and unintentional injuries. This greater incidence, in turn, is related to a complex interaction of behavioral, social, political, genetic, medical, and health care access factors. Thus, to influence the persistent racial disparity in infant mortality, a highly integrated approach is needed, with interventions adapted along a continuum from childhood through the periods of young adulthood, pregnancy, postpartum and beyond. The content and methodologies of these interventions need to be adapted to the underlying behaviors, social influences, and technology and access issues they are meant to address.

Bed sharing among black infants and sudden infant death syndrome: interactions with other known risk factors

OBJECTIVE

Bed sharing has been associated with sudden infant death syndrome (SIDS) and may contribute to the racial disparity seen in infant mortality. It is unclear how bed sharing interacts with other factors to impact SIDS risk. We aimed to measure the effects of bed sharing on risk of SIDS in blacks and to determine whether the risk is modified by other characteristics of the sleep environment.

METHODS

Characteristics of 195 black infants who died of SIDS were compared with matched controls. The moderating influence of known SIDS risk factors on the effect of bed sharing on risk of SIDS was examined using logistic regression.

RESULTS

Almost half (47.4%) of the study population bed shared during the last/reference sleep (58% cases and 37% controls). Bed sharing was associated with 2 times greater risk of SIDS compared with not bed sharing. The deleterious effect of bed sharing was more pronounced with a soft sleep surface, pillow use, maternal smoking, and younger infant age. However, bed sharing was still associated with an increased risk of SIDS, even when the infant was not using a pillow or sleeping on a firm surface. The strongest predictors of SIDS among bed-sharing infants were soft sleep surface, nonuse of a pacifier, and maternal smoking during pregnancy.

CONCLUSIONS

Bed sharing is a common practice among black infants. It is associated with a clear and strong increased risk of SIDS, which is even greater when combined with other known risk factors for SIDS. This practice likely contributes to the excess incidence of SIDS among blacks, and culturally competent education methods must be developed to target this high-risk group.

Innovative Strategies to Reduce Disparities in the Quality of Prenatal Care in Underresourced Settings

This study examined what innovative strategies, including the use of health information technology (health IT), have been or can be used to reduce disparities in prenatal care quality in underresourced settings. Based on literature review and key informant interviews, the authors identified 17 strategies that have been or can be used to (a) increase access to timely prenatal care, (b) improve the content of prenatal care, and (c) enhance the organization and delivery of prenatal care. Health IT can be used to (a) increase consumer awareness about the importance of preconception and early prenatal care, facilitate spatial mapping of access gaps, and improve continuity of patient records; (b) support collaborative quality improvement, facilitate performance measurement, enhance health promotion, assist with care coordination, reduce clinical errors, improve delivery of preventive health services, provide decision support, and encourage completeness of documentation; and (c) support data integration and engineer collaborative innovation.

Health inequalities in the Caribbean: increasing opportunities and resources

Social inequalities in health are not a priority in the Caribbean region. However, a few studies suggested such disparities and indicators show important socioeconomic disparities between and within countries. There are indications that governments' investment in health and other social programs is insufficient in the region and that regional health institutions that guide national health policies and programs do not make the reduction of social inequalities a priority. Furthermore, the public health sector is generally weak and health services are mainly focusing on curative services. The author argues that there is a need to develop and to implement social policies that include equity and social justice as core values. In order to increase the focus on health inequalities in the region, there is also a need to strengthen the Public Health field that integrates Health Promotion strategies. It is also suggested that international, regional and national health sectors that include academic and research institutions, health-related journals and associations, and non-governmental organizations put health inequalities in the Caribbean on their agenda. Furthermore, there should be a fundamental switch from a biomedical perspective of health to a paradigm that considers health as the expression of political, social and economic circumstances.

Disparities in sleep position awareness and compliance

OBJECTIVES

To identify demographic predictors of caregivers who are more likely to position their infants prone for sleep; to determine caregivers' primary information sources regarding sleep position recommendations; and to determine the primary influence on choice of infant sleep position among caregivers who still place their infants in an at-risk sleep position when informed of the recommendations.

METHODS

Survey of caregivers of 205 infants from birth to 24 months at 2 rural and 2 urban private pediatric practices in Southwest Tennessee.

RESULTS

Income was a significant predictor (P < 0.05) of caregivers' awareness of sleep position recommendations. Awareness rates were 74% among respondents with an income of less than $20,000 and 98% among those earning above $80,000. The primary source of sleep position recommendations for lower income and African American respondents was hospital staff; higher income and European Americans reported printed materials as the primary source. Among respondents who were aware of the recommendations but noncompliant, 60% reported infant preference as the primary influence on choice of sleep position.

CONCLUSIONS

Based on this study, particular emphasis needs to be placed on reaching out to lower income groups to disseminate the American Academy of Pediatrics (AAP) sleep positioning recommendations. The importance of positioning infants supine for sleep must be stressed before mother and baby are discharged from the hospital. Caregivers need to understand that many infants prefer to sleep on their stomachs, but there are ways to help babies adapt to supine sleeping.

Influence of prior advice and beliefs of mothers on infant sleep position

OBJECTIVES

To determine the relationship between the advice mothers receive about infant sleep position and the actual position they place their infants in to sleep and to understand modifiers of that relationship, especially beliefs about infant comfort and safety.

DESIGN

Cross-sectional, face-to-face interviews.

SETTING

Women, Infants, and Children centers in the United States from 2006 to 2008.

PARTICIPANTS

A total of 2299 predominantly African American mothers of infants younger than 8 months.

MAIN EXPOSURE

Advice received and beliefs about infant sleep position.

OUTCOME MEASURE

Usually supine infant sleep position.

RESULTS

Advice for exclusively supine infant sleep position from family (OR, 1.6; 95% CI, 1.17-2.17), doctors (OR, 2.28; 95% CI, 1.77-2.93), nurses (OR, 1.46; 95% CI, 1.15-1.84), or the media (OR, 1.54; 95% CI, 1.22-1.95) was associated with usually placing an infant supine to sleep. Additional sources of advice for exclusively supine position significantly increase the odds that an infant will be placed supine. Mothers who believe an infant is comfortable supine are more likely to place their infants on their backs to sleep (OR, 4.05; 95% CI, 2.51-6.53). Mothers who believe an infant will choke on its back are less likely to place their infants supine (OR, 0.36; 95% CI, 0.24-0.54).

CONCLUSION

Among predominantly African American mothers, increasing advice for exclusively supine sleep and addressing concerns about infant comfort and choking remain critical to getting more infants on their back to sleep.

Maternal assessment of physician qualification to give advice on AAP-recommended infant sleep practices related to SIDS

OBJECTIVE

The American Academy of Pediatrics (AAP) strongly recommends the supine-only sleep position for infants and issued 2 more sudden infant death syndrome (SIDS) reduction recommendations: avoid bed sharing and use pacifiers during sleep. In this study, we investigated the following: 1) if mothers from at risk populations rate physicians as qualified to give advice about sleep practices and 2) if these ratings were associated with reports of recommended practice.

METHODS

A cross-sectional survey of mothers (N=2355) of infants aged <8 months was conducted at Women, Infants, and Children (WIC) Program centers in 6 cities from 2006 to 2008. The predictor measures were maternal rating of physician qualification to give advice about 3 recommended sleep practices and reported nature of physician advice. The dependent measures were maternal report of usage of recommended behavior: 1) "infant usually placed supine for sleep," 2) "infant usually does not share a bed with an adult during sleep," and 3) "infant usually uses a pacifier during sleep."

RESULTS

Physician qualification ratings varied by topic: sleep position (80%), bed sharing (69%), and pacifier use (60%). High ratings of physician qualification were associated with maternal reports of recommended behavior: supine sleep (adjusted odds ratio [AOR] 2.1, 95% confidence interval [CI], 1.6-2.6); usually no bed sharing (AOR 1.5, 95% CI, 1.2-1.9), and usually use a pacifier during sleep (AOR 1.2, 95% CI, 1.0-1.5).

CONCLUSIONS

High maternal ratings of physician qualification to give advice on 2 of the 3 recommended sleep practices targeted to reduce the risk of SIDS were significantly associated with maternal report of using these behaviors. Lower ratings of physician qualification to give advice about these sleep practices may undermine physician effectiveness in promoting the recommended behavior.

Health disparities beginning in childhood: a life-course perspective

In this article we argue for the utility of the life-course perspective as a tool for understanding and addressing health disparities across socioeconomic and racial or ethnic groups, particularly disparities that originate in childhood. Key concepts and terms used in life-course research are briefly defined; as resources, examples of existing literature and the outcomes covered are provided along with examples of longitudinal databases that have often been used for life-course research. The life-course perspective focuses on understanding how early-life experiences can shape health across an entire lifetime and potentially across generations; it systematically directs attention to the role of context, including social and physical context along with biological factors, over time. This approach is particularly relevant to understanding and addressing health disparities, because social and physical contextual factors underlie socioeconomic and racial/ethnic disparities in health. A major focus of life-course epidemiology has been to understand how early-life experiences (particularly experiences related to economic adversity and the social disadvantages that often accompany it) shape adult health, particularly adult chronic disease and its risk factors and consequences. The strong life-course influences on adult health could provide a powerful rationale for policies at all levels--federal, state, and local--to give more priority to investment in improving the living conditions of children as a strategy for improving health and reducing health disparities across the entire life course.

Does cot death still exist?

With leading researchers saying smoking and other modifiable factors account for most sudden infant deaths, Jonathan Gornall asks whether it is time to put the diagnosis to bed

Association of poverty with sudden infant death syndrome in metropolitan counties of the United States in the years 1990 and 2000

BACKGROUND

Sudden infant death syndrome (SIDS) has been associated with poverty indirectly in the United States with the use of vital statistics data by using proxies of socioeconomic status such as maternal education.

OBJECTIVES

The objective of this analysis was to examine the relationship of poverty to SIDS at an ecologic level, by examining the association between poverty within metropolitan counties of the United States and the occurrence of SIDS within those metropolitan counties.

METHODS

The percentage of each US county's population below established federal poverty guidelines (poverty index) was obtained from US Census data for 1990 and 2000 by race (Hispanic-HISP, non-Hispanic white-NHW, and non-Hispanic black-NHB). These data were merged by year of birth, county, and race with US Vital Statistics Linked Birth and Infant Death Certificate data.

RESULTS

Fourth (highest poverty quartile) versus first quartile poverty odds ratios (OR) were significantly increased in 1990 and 2000 for NHB (OR1990 = 1.84, OR2000 = 2.29) and NHW (OR1990 = 1.87, OR2000 = 2.17), but not for HISP (OR1990 = 0.64, OR2000 = 0.59).

CONCLUSIONS

There is a significant association between poverty and SIDS at the metropolitan county level for NHB and NHW. Hispanics do not demonstrate this association.

The effectiveness of cigarette regulations in reducing cases of Sudden Infant Death Syndrome

Sudden Infant Death Syndrome (SIDS) is a leading cause of mortality among infants and is responsible for thousands of infant deaths every year. Prenatal smoking and postnatal environmental smoke have been identified as strong risk factors for SIDS. Given the link between smoking and SIDS, this paper examines the direct effects of cigarette prices, taxes and clean indoor air laws in explaining changes in the incidence of SIDS over time in the United States. State-level counts of SIDS cases are generated from death certificates for 1973-2003. After controlling for some observed and unobserved confounding factors, the results show that higher cigarette prices and taxes are associated with reductions in SIDS cases. Stronger restrictions on smoking in workplaces, restaurants and child care centers are also effective in reducing SIDS deaths.

Infant death scene investigation and the assessment of potential risk factors for asphyxia: a review of 209 sudden unexpected infant deaths

At the Wayne County Medical Examiner Office (WCMEO) in Detroit, Michigan, from 2001 to 2004, thorough scene investigations were performed on 209 sudden and unexpected infant deaths, ages 3 days to 12 months. The 209 cases were reviewed to assess the position of the infant at the time of discovery and identify potential risk factors for asphyxia including bed sharing, witnessed overlay, wedging, strangulation, prone position, obstruction of the nose and mouth, coverage of the head by bedding and sleeping on a couch. Overall, one or more potential risk factors were identified in 178 of 209 cases (85.2%). The increasing awareness of infant positions at death has led to a dramatic reduction in the diagnosis of sudden infant death syndrome at the WCMEO. This study suggests that asphyxia plays a greater role in many sudden infant deaths than has been historically attributed to it.

Infant care practices associated with sudden infant death syndrome: findings from the Pacific Islands Families study

AIM

To report infant care practice prevalence for known modifiable sudden infant death syndrome (SIDS) risk factors among a generally disadvantaged yet low-SIDS rate population of mothers with Pacific infants.

METHODS

The Pacific Islands Families study follows a cohort of Pacific infants born at a large tertiary hospital in South Auckland, between 15 March and 17 December 2000. Maternal self-report of infant care practices was undertaken at interview 6 weeks post-partum.

RESULTS

Overall, 1376 mothers self-reported upon their care practices for infants with median age of 7 weeks. Current maternal smoking was reported by 29%. Of infants: 50% were fully breastfed; 1% were placed prone to sleep; 50% usually bed-shared with their mother and 12% usually bed-shared with a mother who smoked; and 94% usually and 1% occasionally slept in the same room as their mother. Except for room sharing (P = 0.09), there were significant differences in these practices between the three major Pacific Island ethnic subgroups (all P < 0.001).

CONCLUSION

Adoption of bed-sharing and room-sharing practices appears to be saving Pacific infants' lives, even though the New Zealand Cot Death Association has discouraged bed-sharing and not actively promoted room sharing. Mothers need to receive adequate information antenatally about the risks and benefits of room-sharing, bed-sharing and safe-sleeping practices and environments should they decide or have no option but to bed-share.

Persistent socioeconomic disparities in infant, neonatal, and postneonatal mortality rates in the United States, 1969-2001

OBJECTIVES

This study examines changing patterns of inequalities in US infant, neonatal, and postneonatal mortality rates between 1969 and 2001 by area deprivation and maternal education.

METHODS

A deprivation index was linked to county vital records data to derive annual infant mortality rates by deprivation quintiles from 1969 to 2000. Rates by maternal education were computed for 1986, 1991, 1996, and 2001 using national linked birth/infant death files. Log-binomial regression was used to estimate relative risks of infant mortality by deprivation and time period. Cox regression was used to model overall and birth weight-specific infant mortality risks by maternal education after adjusting for covariates. Temporal disparities were summarized by log-linear regression and inequality indices.

RESULTS

Although absolute disparities have narrowed over time, relative socioeconomic disparities in infant mortality have increased since 1985. In 1985-1989, infants in the most deprived group had, respectively, 36% and 57% higher risks of neonatal and postneonatal mortality than infants in the least deprived group. The corresponding relative risks increased to 43% and 96% in 1995-2000. The adjusted risk of infant mortality was 22% higher in 1986 for mothers with < 12 years of education than for those with > or = 16 years of education, with the relative risk increasing to 41% in 2001. Disparities were greatest among normal birth weight infants, with education-specific relative risks of neonatal and postneonatal mortality increasing significantly between 1986 and 2001.

CONCLUSIONS

Dramatic declines in infant mortality among all of the socioeconomic groups during 1969-2001 represent a major public health success. However, substantial socioeconomic disparities persisted in both neonatal and postneonatal mortality. Relatively larger declines in infant and postneonatal mortality among higher socioeconomic groups have contributed to the widening gap in mortality since 1985. Persistent disparities in infant mortality may reflect increasing polarization among socioeconomic groups in material and social conditions, smoking during pregnancy, and health care services.