Beyond birth outcomes: Interpregnancy interval and injury‐related infant mortality

Background Several studies have examined the association between IPI and birth outcomes, but few have explored the association between interpregnancy interval (IPI) and postnatal outcomes. Objective We examined the association between IPI and injury‐related infant mortality, a leading cause of postn...

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Bibliographic Details
Published in:Paediatric and perinatal epidemiology 2019-09, Vol.33 (5), p.360-370
Main Authors: Thoma, Marie E., Rossen, Lauren M., De Silva, Dane A., Warner, Margaret, Simon, Alan E., Moskosky, Susan, Ahrens, Katherine A.
Format: Article
Language:English
Subjects:
Adult
Birth Certificates
Birth Intervals - statistics & numerical data
birth spacing
Births
Child Abuse - mortality
Child Abuse - statistics & numerical data
Death Certificates
Depression, Postpartum - epidemiology
Family planning
Female
Hazards
Health risk assessment
Health risks
Humans
Infant
Infant mortality
Infant Mortality - trends
Infant, Newborn
injury
Injury prevention
interpregnancy interval
Male
Maternal Age
Minority & ethnic groups
parity
Postpartum
Poverty
Pregnancy
Proportional Hazards Models
Retrospective Studies
Sibling Relations
Socioeconomic Factors
Statistical models
United States - epidemiology
Vital statistics
Wounds and Injuries - mortality
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Summary:Background Several studies have examined the association between IPI and birth outcomes, but few have explored the association between interpregnancy interval (IPI) and postnatal outcomes. Objective We examined the association between IPI and injury‐related infant mortality, a leading cause of postneonatal mortality. Methods We used 2011‐2015 US period‐linked birth‐infant death vital statistics data to generate a multiyear birth cohort of non‐first‐born singleton births (N = 9 782 029). IPI was defined as the number of months between a live birth and the start of the pregnancy leading to the next live birth. Causes of death in the first year of life were identified using ICD‐10 codes. Hazard ratios (HR) for IPI categories were estimated using Cox proportional hazards models adjusted for birth order, county poverty level, and maternal characteristics (marital status, race/ethnicity, education, age at previous birth). Results After adjustment, overall infant mortality (48.1 per 10 000 births) was higher for short and long IPIs compared with IPI 18‐23 months (reference):
ISSN:0269-5022
1365-3016
1365-3016
DOI:10.1111/ppe.12575