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Stepwise logistic regression analyses for perinatal risk factors associated with autism spectrum disorder (confirmed or provisional)
| Perinatal risk factors | Adjusted odds ratio (95% CI) |
|---|---|
| Maternal characteristics | |
| Maternal age | |
| <35 years | Reference |
| ≥35 years | 2.22 (1.08–4.57) |
| Smoking during pregnancy | 5.67 (1.86–17.29) |
| Infant characteristics | |
| Male sex | 4.63 (2.12–10.10) |
| Small for gestational age | 3.03 (1.02–9.01) |
