Table 3.
Descriptive characteristics of ASD phenotypic subgroups.
| ASD + ID | ASD no-ID | ASD-ID vs ASD no-ID | |
|---|---|---|---|
| N = 285 | N = 219 | ||
| N (%) | N (%) | χ2 p value | |
| Maternal age | 0.18 | ||
| <20 | 12 (4.21%) | 5 (2.28%) | |
| 20–24 | 50 (17.54%) | 25 (11.42%) | |
| 25–29 | 71 (24.91%) | 67 (30.59%) | |
| 30–34 | 98 (34.39%) | 81 (36.99%) | |
| >=35 | 54 (18.95%) | 41 (18.72%) | |
| Maternal race | 0.34 | ||
| White | 203 (71.23%) | 170 (77.63%) | |
| Asian | 62 (21.75%) | 37 (16.89%) | |
| Other | 16 (5.61%) | 11 (5.02%) | |
| Missing | 4 (1.4%) | 1 (0.46%) | |
| Maternal ethnicity | 0.03 | ||
| Hispanic | 129 (45.26%) | 77 (35.16%) | |
| Not Hispanic | 152 (53.33%) | 141 (64.38%) | |
| Missing | 4 (1.4%) | 1 (0.46%) | |
| Parity | 0.01 | ||
| Multiparous | 167 (58.6%) | 102 (46.58%) | |
| Primiparious | 118 (41.4%) | 117 (53.42%) | |
| Maternal birth country | 0.03 | ||
| US | 126 (44.21%) | 123 (56.16%) | |
| Mexico | 77 (27.02%) | 45 (20.55%) | |
| Other | 82 (28.77%) | 51 (23.29%) | |
| Maternal education | 0.00 | ||
| <High School | 61 (21.4%) | 26 (11.87%) | |
| High School Grad | 69 (24.21%) | 42 (19.18%) | |
| Undergrad College | 105 (36.84%) | 101 (46.12%) | |
| Post-Grad College | 44 (15.44%) | 49 (22.37%) | |
| Unknown | 6 (2.11%) | 1 (0.46%) | |
| Child characteristics | |||
| Child sex | 0.74 | ||
| Male | 231 (81.05%) | 180 (82.19%) | |
| Female | 54 (18.95%) | 39 (17.81%) | |
| Birth type | 0.64 | ||
| Singleton | 279 (97.89%) | 213 (97.26%) | |
| Multiple | 6 (2.11%) | 6 (2.74%) | |
| Birth weight | 0.19 | ||
| <1500 g | 5 (1.75%) | 0 (0%) | |
| 1500–2499 g | 22 (7.72%) | 14 (6.39%) | |
| >=2500 g | 258 (90.53%) | 205 (93.61%) | |
| Gestational age | 0.23 | ||
| <32 weeks | 8 (2.81%) | 3 (1.37%) | |
| 33–36 weeks | 24 (8.42%) | 12 (5.48%) | |
| >=37 weeks | 253 (88.77%) | 204 (93.15%) | |
Demographic differences between groups was calculated by χ2 test and p values > 0.05 were bolded and considered significant.
ASD + ID Autism spectrum disorder with co-occurring intellectual disability, ASD no-ID autism spectrum disorder without co-occurring intellectual disability.