Table 2.
Demographic characteristics for children with a diagnosis of autism spectrum disorder (ASD) enrolled in the Study to Explore Early Development (SEED), excluding intellectual disability (ID), compared to those with developmental delay (DD) with likely, possible, some, or no social communication disorder (SCD) based on selected items from the Autism Diagnostic Interview-Revised (ADI-R).
| Variable | ASD No ID | DD Likely SCD | ASD vs. Likely SCD | DD Possible SCD | DD Some SCD | DD No SCD | Likely SCD vs. No SCD |
|---|---|---|---|---|---|---|---|
| N=642 | N=117 | Comparison | N=118 | N=126 | N=91 | Comparison | |
| Child Age (months) | 59.6 | 60.3 | t(757)= −1.3 | 60.2 | 60.3 | 60.6 | t(206)= −0.4 |
| (SD=5.5) | (SD=5.7) | Diff.a= −0.7 | (SD=6.0) | (SD=5.4) | (SD=5.4) | Diff.a= −0.3 | |
| CIb=−1.8, 0.4 | CIb= −1.8, 1.2 | ||||||
| p= .21 | p= .70 | ||||||
| Child Sex | missing=1 | missing=1 | missing=1 | missing=1 | missing=2 | ||
| Female | 114 (18%) | 33 (28%) | X21 =7.1 | 32 (27%) | 28 (22%) | 36 (40%) | X21 =3.2 |
| Male | 527 (82%) | 83 (71%) | p= .01 | 85 (72%) | 97 (77%) | 53 (58%) | p= .07 |
| Child Ethnicity | |||||||
| Hispanic | 105 (16%) | 19 (16%) | X21= 0.0 | 22 (19%) | 20 (16%) | 10 (11%) | X21=1.2 |
| Non-Hispanic | 537 (84%) | 98 (84%) | p= .98 | 96 (81%) | 106 (84%) | 81 (89%) | p= .28 |
| Child Race | missing=16 | missing=1 | missing=5 | missing=1 | missing=8 | ||
| White | 372 (59%) | 62 (53%) | X23 =9.1 | 59 (50%) | 55 (44%) | 21 (23%) | X23=17.0 |
| Black | 106 (17%) | 32 (28%) | p= .03 | 33(28%) | 47 (37%) | 40 (44%) | p<.01 |
| Multiracial | 85 (14%) | 16 (14%) | 14 (12%) | 13 (10%) | 13 (14%) | ||
| Other | 63 (10%) | 6 (5%) | 7 (6%) | 10 (8%) | 9 (10%) | ||
| Maternal Education | missing=12 | missing=1 | missing=3 | missing=4 | |||
| High school or less | 79 (12%) | 21 (18%) | X23=11.8 | 25 (21%) | 33 (26%) | 29 (32%) | X23=7.7 |
| Some college | 185 (29%) | 46 (39%) | p= .01 | 40 (34%) | 38 (30%) | 33 (36%) | p= .05 |
| Bachelor’s degree | 206 (32%) | 33 (28%) | 26 (22%) | 33 (26%) | 19 (21%) | ||
| Master’s or higher | 160(25%) | 16 (14%) | 24 (20%) | 22 (17%) | 6 (7%) |
a
Diff. = observed group difference,
b
CI = 95% confidence interval