Table 1.
Sample characteristics
| Unaffected | Broader Autism Phenotype | Autism Spectrum Disorder
|
|||
|---|---|---|---|---|---|
| Total | Early Identified | Late Identified | |||
| n=121 | n=31 | n=52 | n=27 | n=25 | |
| Sample size at each age | |||||
| 6 months | 91 | 28 | 29 | 13 | 16 |
| 14 months | 115 | 31 | 51 | 26 | 25 |
| 18 months | 63 | 18 | 28 | 15 | 13 |
| 24 months | 117 | 28 | 51 | 26 | 25 |
| 30 months | 56 | 16 | 27 | 14 | 13 |
| 36 months | 114 | 29 | 47 | 23 | 24 |
| Male sex, n (column %) | 53 (43.8%) | 23 (74.2%) | 43 (82.7%) | 21 (77.8%) | 22 (88%) |
| Ethnicity, n (column %) | |||||
| Caucasian | 113 (91.6%) | 34 (89.5%) | 40 (74.1%) | 21 (75%) | 19 (73.1%) |
| African American | 3 (2.1%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Asian | 1 (0.7%) | 1 (2.6%) | 2 (3.7%) | 1 (3.6%) | 1 (3.8%) |
| Multiracial | 3 (2.1%) | 1 (2.6%) | 9 (16.7%) | 5 (17.9%) | 4 (15.4%) |
| Unknown | 2 (3.5%) | 1 (2.6%) | 3 (5.56%) | 1 (3.6%) | 2 (10.5%) |
| SES* | 56.54 | 57.21 | 57.65 | 56.62 | 58.82 |
| ADOS** | |||||
| Communication Total | 1.85 | 3.42 | 4.89 | 4.63 | 5.31 |
| Social Total | 2.06 | 4.63 | 7.96 | 8.85 | 7.23 |
*
SES refers to the Hollingshead socioeconomic score. This score is derived from both parents’ highest level of education completed and their occupations. A higher score is indicative of higher socioeconomic status. The maximum observed score is 66.
**
ADOS scores are means from the last visits of children.