Rizzolo A, Shah PS, Bertelle V, Makary H, Ye XY, Abenhaim HA, Piedboeuf B, Beltempo M. Association of timing of birth with mortality among preterm infants born in Canada.
J Perinatol 2021;
41:2597-2606. [PMID:
34050244 DOI:
10.1038/s41372-021-01092-9]
[Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 03/31/2021] [Accepted: 04/30/2021] [Indexed: 11/09/2022]
Abstract
OBJECTIVE
To assess the association between time of birth and mortality among preterm infants.
STUDY DESIGN
Population-based study of infants born 22-36 weeks gestation (GA) in Canada from 2010 to 2015 (n = 173 789). Multivariable logistic regression models assessed associations between timing of birth and mortality.
RESULT
Among infants 22-27 weeks GA, evening birth was associated with higher mortality than daytime birth (adjusted odds ratio [AOR] 1.14, 95% CI 1.01-1.29). Among infants 28-32 weeks GA and 33-36 weeks GA, night birth was associated with lower mortality than daytime birth (AOR 0.75, 95% CI 0.59-0.95; AOR 0.78, 95% CI 0.62-0.99, respectively). Sensitivity analysis excluding infants with major congenital anomaly revealed that associations between hour of birth and mortality among infants born 28-32 and 33-36 weeks GA decreased or were not statistically significant.
CONCLUSION
Higher mortality among extremely preterm infants during off-peak hours may suggest variations in available resources based on time of day.
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