Risk factors for autism in Danish children born after 1972 who were at risk until 1999*
| Risk factor | Comparison | RR (95% CI)† |
|---|---|---|
| *RR = relative risk. CI defined in glossary. | ||
| †Adjusted model including perinatal factors, parental psychiatric history, and socioeconomic characteristics. | ||
| Fetal presentation | Breech v cephalic | 1.63 (1.18 to 2.26) |
| Apgar score at 5 minutes | 1–7 v 10 | 1.89 (1.10 to 3.27) |
| Gestational age at birth (wks) | <35 v 37–42 | 2.45 (1.55 to 3.86) |
| Parental psychiatric history | Schizophrenia-like psychosis v none | 3.44 (1.48 to 7.95) |
| Affective disorder v none | 2.91 (1.65 to 5.14) | |
| Other v none | 2.85 (2.20 to 3.69 | |