Table 6.

Follow-up tests for effect modification: conditional logistic regression results on cumulative dose of sOT and mode of delivery as variables associated with ASD (n = 294).

Variable	OR	95% CI	p value
Cumulative dose of sOT per 500 units	1.040	0.985–1.099	0.157
C/S first-time no fetal indication versus normal delivery (reference)	4.623	1.122–19.042	0.034
Cumulative dose of sOT per 500 units × mode of delivery	0.974	0.899–1.056	0.531

OR > 1 indicates higher odds of ASD. Variables controlled for were maternal hypertension, maternal diabetes, maternal education, birth weight, maternal body mass index, child race, smoking during pregnancy, alcohol use during pregnancy, and paternal age. sOT: synthetic oxytocin; ASD: autism spectrum disorder; OR: odds ratio, CI: confidence interval; C/S: Cesarean section.