A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes
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 bor...
| Main Authors: | , |
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| Format: | Journal Article |
| Published: |
Oxford University Press
2018
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| Online Access: | http://purl.org/au-research/grants/nhmrc/1099655 http://hdl.handle.net/20.500.11937/71844 |
| _version_ | 1848762587696594944 |
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| author | Regan, A. Pereira, Gavin |
| author_facet | Regan, A. Pereira, Gavin |
| author_sort | Regan, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T10:49:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-71844 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:49:56Z |
| publishDate | 2018 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-718442023-11-02T02:27:46Z A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes Regan, A. Pereira, Gavin 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. 2018 Journal Article http://hdl.handle.net/20.500.11937/71844 https://doi.org/10.1093/aje/kwy188 http://purl.org/au-research/grants/nhmrc/1099655 http://purl.org/au-research/grants/nhmrc/1047263 Oxford University Press unknown |
| spellingShingle | Regan, A. Pereira, Gavin A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes |
| title | A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes |
| title_full | A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes |
| title_fullStr | A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes |
| title_full_unstemmed | A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes |
| title_short | A population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes |
| title_sort | population-based matched sibling analysis estimating the association between first interpregnancy interval and birth outcomes |
| url | http://purl.org/au-research/grants/nhmrc/1099655 http://purl.org/au-research/grants/nhmrc/1099655 http://hdl.handle.net/20.500.11937/71844 |