Comparison of infants in the low risk control group (LRC) and the high risk for autism group (HRA) on demographic characteristics.

(a) Education was reported on a scale of 1–9. (1) some high school; (2) high school graduate; (3) some college; (4) community college or 2 yr degree; (5) 4 yr college degree; (6) some graduate school; (7) master’s degree (8) doctoral degree; (9) professional degree. (b) Income was reported on a scale of 1–8. (1) less than $15,000; (2) $15,000–25,000; (3) $25,000–35,000; (4) $35,000–45,000; (5) $45,000–55,000; (6) $55,000–65,000; (7) $65,000–75,000 (8)more than $75,000. *Significant at p<0.05.