Table 5.

Conditional logistic regression results on the association between clinical variables and the odds of ASDs among boys (n = 274 or 137 pairs).

Variablea	OR	95% CI	p value
Cumulative dose of sOT per 500 mU	1.059	1.015–1.105	0.008
Maximum dose rate per 10 mU/min	1.628	1.029–2.575	0.037
Time of exposure per 500 min	2.065	1.255–3.398	0.004

OR > 1 indicates higher odds of ASD. Variables controlled for were maternal hypertension, maternal diabetes, maternal education, indication for delivery (including fetal indications), birth weight, maternal body mass index, mode of delivery, child race, smoking during pregnancy, alcohol use during pregnancy, and paternal age. ASDs: autism spectrum disorders; OR: odds ratio, CI: confidence interval; sOT: synthetic oxytocin.

^aThe exposure variables (cumulative dose of sOT, maximum dose rate, and time of exposure) were run in separate models. Each model consisted of the exposure variable, covariates, and the outcome.