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Characteristics of the sample (n = 418)
| Age at enrollment in months, mean (SD) | 7.0 (4.1) |
| Gender, n (%) | |
| Female | 172 (41%) |
| Male | 246 (59%) |
| Outcome (36 months), n (%) | |
| ASD | 110 (26%) |
| Not ASD | 308 (74%) |
| Race1, n (%) | |
| Caucasian | 308 (83%) |
| Non-Caucasian | 61 (17%) |
| Hispanic2, n (%) | |
| No | 260 (95%) |
| Yes | 14 (5%) |
| Multiplex Status3, n (%) | |
| No | 343 (89%) |
| Yes | 44 (11%) |
Note: ASD = autism spectrum disorder.
Frequency Missing = 49
Frequency Missing = 144
Frequency Missing = 31
