Table 1.
Basic Characteristics of the Full Study Group and by Advanced Maternal and Paternal Age Categories
| Maternal age | Paternal age <40 years (n = 306) | >40 years (n = 91) | |||
|---|---|---|---|---|---|
| Full study group (n = 397) | <35 years (n = 221) | >35 years (n = 176) | |||
| Child characteristics—n (%) unless noted | |||||
| Female | 148 (37.3%) | 95 (43.0%) | 53 (30.1%) | 117 (38.2%) | 31 (34.1%) |
| Male | 249 (62.7%) | 126 (57.0%) | 123 (69.9%) | 189 (61.8%) | 60 (65.9%) |
| ASD diagnosis | 76 (20.1%) | 40 (19.0) | 36 (21.4) | 55 (18.9) | 21 (24.1) |
| SRS raw score (mean, SD) | 38.6 (29.9) | 38.0 (30.4) | 39.4 (29.5) | 38.3 (30.2) | 39.9 (29.3) |
| SRS T score (mean, SD) | 50.3 (13.3) | 50.0 (13.4) | 50.6 (13.1) | 50.1 (13.2) | 50.7 (13.7) |
| MSEL ELC (mean, SD) | 98.5 (19.4) | 96.7 (19.8) | 100.8 (18.6) | 97.6 (19.9) | 101.9 (16.9) |
| VABS composite (mean, SD) | 95.7 (13.4) | 96.2 (14.2) | 95.2 (12.2) | 96.3 (13.8) | 93.9 (11.6) |
| Parent characteristics—n (%) unless noted | |||||
| Maternal race/ethnicity | |||||
| Non-Hispanic White | 207 (52%) | 110 (49.8%) | 97 (55.1%) | 155 (50.7%) | 52 (57.1%) |
| Hispanic | 60 (15.1%) | 36 (16.3%) | 24 (13.6%) | 48 (15.7%) | 12 (13.2%) |
| Other | 130 (32.7%) | 75 (33.9%) | 55 (31.2%) | 103 (33.7%) | 27 (29.7%) |
| Maternal education | |||||
| High school or less | 141 (38.0%) | 93 (44.9%) | 48 (29.3%) | 111 (39.4%) | 30 (33.7%) |
| College/college degree | 133 (35.8%) | 69 (33.3%) | 64 (39.0%) | 101 (35.8%) | 32 (36.0%) |
| Graduate degree | 97 (26.1%) | 45 (21.7%) | 52 (31.7%) | 70 (24.8%) | 27 (30.3%) |
| Missing | 26 (6.5%) | 14 (6.3%) | 12 (6.8%) | 24 (7.8%) | 2 (2.2%) |
| Paternal race/ethnicity | |||||
| Non-Hispanic White | 218 (54.9%) | 112 (50.7%) | 106 (60.2%) | 165 (53.9%) | 53 (58.2%) |
| Hispanics | 61 (15.4%) | 37 (16.7%) | 24 (13.6%) | 47 (15.4%) | 14 (15.4%) |
| Other | 118 (29.7%) | 72 (32.6%) | 46 (26.1%) | 94 (30.7%) | 24 (26.4%) |
| Paternal education | |||||
| High school or less | 156 (43.3%) | 96 (48.0%) | 60 (37.5%) | 118 (42.9%) | 38 (44.7%) |
| College/college degree | 105 (29.2%) | 57 (28.5%) | 48 (30.0%) | 83 (30.2%) | 22 (25.9%) |
| Graduate degree | 99 (27.5%) | 47 (23.5%) | 52 (32.5%) | 74 (26.9%) | 25 (29.4%) |
| Missing | 37 (9.3%) | 21 (9.5%) | 16 (9.1%) | 31 (10.1%) | 6 (6.6%) |
| Maternal age (mean, SD) | 34.2 (4.36) | ||||
| Paternal age (mean, SD) | 36.1 (5.38) | ||||
| Maternal age categories | |||||
| <30 | 61 (15.4%) | 61 (20%) | 0 | ||
| 30 to <35 | 160 (40.3%) | 145 (47%) | 15 (16%) | ||
| ≥35 | 176 (44.3%) | 100 (33%) | 76 (84%) | ||
| Paternal age categories | |||||
| <30 | 45 (11.3%) | 43 (19%) | 2 (1%) | ||
| 30 to <35 | 124 (31.2%) | 104 (47%) | 20 (11%) | ||
| 35 to <40 | 137 (34.5%) | 59 (27%) | 78 (44%) | ||
| ≥40 | 91 (22.9%) | 15(7%) | 76 (43%) | ||