Table 1 Sample characteristics of the Early Markers for Autism (EMA) study
| Â | Total (n = 957) | ASD without ID (n = 199) | ASD with ID (n = 180) | ID only (n = 164) | GP (n = 414) | p value |
|---|---|---|---|---|---|---|
Mean (SD) or % | ||||||
Mom age (years) | 28.9 (5.7) | 30.3 (5.6) | 29.6 (5.8) | 27.1 (6.1) | 28.7 (5.4) | < 0.01 |
Dad age (years) | 35.1 (15.8) | 34.9 (12.6) | 36.2 (16.5) | 36.6 (21) | 34.1 (14.3) | 0.26 |
Birthweight (g) | 3371.9 (595.5) | 3437 (615) | 3404.9 (519.7) | 3157.8 (705.6) | 3411 (551.2) | < 0.01 |
Child sex | ||||||
 Female | 21.8 | 17.6 | 19.4 | 41.5 | 17.1 | < 0.01 |
 Male | 78.2 | 82.4 | 80.6 | 58.5 | 82.9 | |
Maternal race | ||||||
 White | 78.9 | 77.9 | 71.7 | 86.6 | 79.5 | 0.04 |
 Asian | 11.6 | 13.1 | 16.7 | 5.5 | 11.1 | |
 Others | 9.5 | 9.0 | 11.7 | 7.9 | 9.4 | |
Hispanic ethnicity | 46.4 | 32.2 | 42.2 | 68.3 | 46.4 | < 0.01 |
Public insurance | 35.6 | 19.6 | 32.2 | 59.8 | 35.3 | < 0.01 |
County | ||||||
 Orange County | 45.4 | 42.7 | 38.9 | 32.3 | 54.6 | <0.01 |
 San Diego | 52.6 | 56.3 | 59.4 | 63.4 | 43.5 | |
 Imperial | 2.1 | 1.0 | 1.7 | 4.3 | 1.9 | |