Table 1.
Descriptive Statistics of ASIB, FXS, and TD Variables
| TD (n = 18) | ASIB (n = 21) | FXS (n = 18) | Group Differences | |
|---|---|---|---|---|
| Age (months) | ||||
| Mean | 12.22 | 12.55 | 12.83 | p = .081 |
| SD | 0.46 | 0.67 | 1.11 | |
| Nonverbal Cognition | ||||
| Mean | 56.28 | 53.76 | 35.67 | p = .000a |
| SD | 7.68 | 9.79 | 10.67 | |
| ADOS-2 CSS | ||||
| Mean | 1.50 | 4.19 | 4.95 | p = .000b |
| SD | 0.71 | 2.04 | 1.90 | |
| SES (dollars) | ||||
| Mean | 70,352 | 78,287 | 74,818 | p = .875 |
| SD | 31,426 | 41,441 | 54,891 | |
| Ethnicity (%) | ||||
| African-American | 11.1 | 4.8 | 11.1 | p = .364 |
| Caucasian | 89.9 | 95.2 | 83.3 | |
| Asian/Pacific Islander | - | - | 5.6 |
Note. TD is typically developing controls; ASIB is younger siblings of children with ASD; FXS is infants with fragile X syndrome; SD is standard deviation; ADOS-2 CSS is Autism Diagnosis Observation Scale Second Edition calibrated severity score; SES is socio-economic status
a
Group differences found on nonverbal cognition (FXS < ASIB/TD)
b
Group differences found on ADOS-2 CSS (TD < ASIB/FXS)