TABLE 2.
Characteristics of preschool-aged children with autism spectrum disorder and subthreshold characteristics in the Study to Explore Early Development
| Autism spectrum disorder | p value | Subthreshold characteristics | p value | |||
|---|---|---|---|---|---|---|
| SEED1 N = 707 | SEED2 N = 773 | SEED1 N = 306 | SEED2 N = 288 | |||
| No. (%) | No. (%) | No. (%) | No. (%) | |||
| Child intellectual disability | ||||||
| No | 255 (36.64) | 275 (35.99) | 0.80 | 198 (65.78) | 194 (67.36) | 0.68 |
| Yes | 441 (63.36) | 489 (64.01) | 103 (34.22) | 94 (32.64) | ||
| Child sex | ||||||
| Boys | 580 (82.04) | 628 (81.24) | 0.73 | 230 (75.16) | 187 (64.93) | <0.01 |
| Girls | 127 (17.96) | 145 (18.76) | 76 (24.84) | 101 (35.07) | ||
| Maternal age | ||||||
| 40 years or older | 190 (26.87) | 168 (21.73) | 0.14 | 67 (21.90) | 59 (20.49) | 0.87 |
| 35–39 years | 231 (32.67) | 274 (35.45) | 80 (26.14) | 74 (25.69) | ||
| 30–34 years | 188 (26.59) | 214 (27.68) | 83 (27.12) | 75 (26.04) | ||
| 29 years or younger | 98 (13.88) | 117 (15.14) | 76 (24.84) | 80 (27.78) | ||
| Maternal education | ||||||
| College/advanced degree | 361 (52.02) | 423 (54.79) | 0.31 | 104 (34.10) | 111 (38.81) | 0.46 |
| Associates degree | 219 (31.56) | 248 (32.12) | 106 (34.75) | 98 (34.27) | ||
| High school diploma | 79 (11.38) | 73 (9.46) | 53 (17.38) | 48 (16.78) | ||
| No high school diploma | 35 (5.04) | 28 (3.63) | 42 (13.77) | 29 (10.14) | ||
| Maternal race/ethnicity | ||||||
| Non-Hispanic white | 386 (55.70) | 354 (46.52) | <0.01 | 130 (42.62) | 119 (41.90) | 0.98 |
| Non-Hispanic black | 137 (19.76) | 198 (26.02) | 95 (31.15) | 92 (32.39) | ||
| Non-Hispanic other | 85 (12.27) | 88 (11.56) | 27 (8.85) | 26 (9.15) | ||
| Hispanic | 85 (12.27) | 121 (15.90) | 53 (17.38) | 47 (16.55) | ||
Note: 8 children from SEED1 and 9 children from SEED2 were missing data on intellectual disability; 13 mothers from SEED1 and 1 mother from SEED2 were missing data on education; 14 mothers from SEED1 and 12 mothers from SEED2 were missing data on race/ethnicity.