Initial findings suggest relationship but with sibling-control analyses, effect almost disappears….
Researchers investigated the association between cesarean section (CS) and type 1 diabetes (T1D), and whether the association remains after accounting for familial confounding by using a sibling-control design.
Ali S. Khashan and colleagues conducted a cohort study analyzing approximately 2,600,000 live births in Sweden including all singleton live births in Sweden between 1982 and 2009, and followed up with sibling-control analyses. T1D diagnoses were identified from the Swedish National Patient Register. Mode of delivery was categorized into unassisted vaginal delivery (reference group), instrumental vaginal delivery (IVD), emergency CS, and elective CS. The statistical analysis was conducted in 2 steps: firstly log-linear Poisson regression with aggregated person-years by using the full cohort; secondly, conditional logistic regression for sibling-control analyses. The sibling analysis included siblings who were discordant for both mode of delivery and T1D.
In the cohort analyses (N = 2,638,083), there was an increased risk of childhood T1D among children born by elective CS (adjusted relative risk [RR] = 1.15 [95% confidence interval: 1.06–1.25]) and IVD (RR=1.14 [1.06–1.23]) but not emergency CS (RR = 1.02 [0.95–1.11]) when compared with children born by unassisted vaginal birth. However, the effect of elective CS and IVD on childhood T1D almost disappeared and became non-significant in the sibling-control analyses.
The present findings suggest a small association between elective CS and IVD and T1D. The sibling-control results, however, suggest that these findings are not consistent with causal effects of mode of delivery on T1D and may be due to familial confounders such as genetic susceptibility and environmental factors.
- Researchers discovered there was a linkage between elective cesarean delivery and risk of type 1 diabetes in children but this linkage almost disappeared and became non-significant in the sibling-control analyses.
Khashan AS, Kenny LC, Lundholm C, et al. Mode of Obstetrical Delivery and Type 1 Diabetes: A Sibling Design Study. Pediatrics. 2014 August 4