Differences in Factors Associated With Preterm and Term Stillbirth: A Secondary Cohort Analysis of the DESiGN Trial

Chivon Winsloe, James Elhindi, Matias C. Vieira, Sophie Relph, Charles G. Arcus, Alessandro Alagna, Annette Briley, Mark Johnson, Louise M. Page, Andrew Shennan, Baskaran Thilaganathan, Neil Marlow, Christoph Lees, Deborah A. Lawlor, Asma Khalil, Jane Sandall, Andrew Copas, Dharmintra Pasupathy, the DESiGN trial team

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Abstract

Objective: To identify whether maternal and pregnancy characteristics associated with stillbirth differ between preterm and term stillbirth. Design: Secondary cohort analysis of the DESiGN RCT. Setting: Thirteen UK maternity units. Population: Singleton pregnant women and their babies. Methods: Multiple logistic regression was used to assess whether the 12 factors explored were associated with stillbirth. Interaction tests assessed for a difference in these associations between the preterm and term periods. Main Outcome Measure: Stillbirth stratified by preterm (<37+0 weeks') and term (37+0–42+6 weeks') births. Results: A total of 195 344 pregnancies were included. Six hundred and sixty-seven were stillborn (3.4 per 1000 births), of which 431 (65%) were preterm. Significant interactions were observed for maternal age, ethnicity, IMD, BMI, parity, smoking, PAPP-A, gestational hypertension, pre-eclampsia and gestational diabetes but not for chronic hypertension and pre-existing diabetes. Stronger associations with term stillbirth were observed in women with obesity compared to BMI 18.5–24.9 kg/m2 (BMI 30.0–34.9 kg/m2 term adjusted OR 2.1 [95% CI 1.4–3.0] vs. preterm aOR 1.1 [0.8–1.7]; BMI ≥ 35.0 kg/m2 term aOR 2.2 [1.4–3.4] vs. preterm aOR 1.5 [1.2–1.8]; p-interaction < 0.01), nulliparity compared to parity 1 (term aOR 1.7 [1.1–2.7] vs. preterm aOR 1.2 [0.9–1.6]; p-interaction < 0.01) and Asian ethnicity compared with White (p-interaction < 0.01). A weaker or lack of association with term, compared to preterm, stillbirth was observed for older maternal age, smoking and pre-eclampsia. Conclusion: Differences in association exist between mothers experiencing preterm and term stillbirth. These differences could contribute to design of timely surveillance and interventions to further mitigate the risk of stillbirth.

Original languageEnglish
Pages (from-to)89-98
Number of pages10
JournalBJOG: An International Journal of Obstetrics and Gynaecology
Volume132
Issue number1
Early online date18 Sept 2024
DOIs
Publication statusPublished - Jan 2025

Keywords

  • fetal growth restriction
  • perinatal death
  • premature birth
  • SGA
  • stillbirth
  • term birth

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