Abstract:
:The association between a single interpregnancy interval (IPI) and birth outcomes has not yet been explored using matched methods. We modeled the odds of preterm birth, being small for gestational age, and having low birth weight in a second, live-born infant in a cohort of 192,041 sibling pairs born in Western Australia between 1980 and 2010. The association between IPI and birth outcomes was estimated from the interaction between birth order and IPI (with 18-23 months as the reference category), using conditional logistic regression. Matched analysis showed the odds of preterm birth were higher for siblings born following an IPI of <6 months (adjusted interaction odds ratio = 1.22, 95% confidence interval: 1.06, 1.38) compared with those born after an IPI of 18-23 months. There were no significant differences for IPIs of <6 months for other outcomes (small for gestational age or low birth weight). This is the first study to use matched analyses to investigate the association between a single IPI on birth outcomes. IPIs of <6 months were associated with increased odds of preterm birth in second-born infants, although the association is likely smaller than previously estimated by unmatched studies.
journal_name
Am J Epidemioljournal_title
American journal of epidemiologyauthors
Regan AK,Ball SJ,Warren JL,Malacova E,Padula A,Marston C,Nassar N,Stanley F,Leonard H,de Klerk N,Pereira Gdoi
10.1093/aje/kwy188subject
Has Abstractpub_date
2019-01-01 00:00:00pages
9-16issue
1eissn
0002-9262issn
1476-6256pii
5090952journal_volume
188pub_type
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