Table 4.
Demographic and follow-up characteristics of the 31,220 individuals still in the community after 3 years of age who comprise the study cohort
| Measure | Birth Period | Overall | ||||
|---|---|---|---|---|---|---|
| 1976–1980 | 1981–1985 | 1986–1990 | 1991–1995 | 1996–2000 | ||
| No. in community after 3 years of age | 5298 | 6393 | 6831 | 6466 | 6232 | 31,220 |
| Baseline | ||||||
| Male gender, N (%) | 2778 (52.4%) | 3300 (51.6%) | 3450 (50.5%) | 3288 (50.8%) | 3193 (51.2%) | 16009 (51.3%) |
| Race, N (%) | ||||||
| White | 3956 (74.7%) | 5162 (80.7%) | 5928 (86.8%) | 5692 (88.0%) | 5056 (81.1%) | 25794 (82.6%) |
| Asian | 24 (0.5%) | 76 (1.2%) | 197 (2.9%) | 224 (3.5%) | 314 (5.0%) | 835 (2.7%) |
| Black or African American | 14 (0.3%) | 20 (0.3%) | 36 (0.5%) | 102 (1.6%) | 339 (5.4%) | 511 (1.6%) |
| Hawaiian or Pacific Islander | 3 (0.1%) | 8 (0.1%) | 5 (0.1%) | 15 (0.2%) | 15 (0.2%) | 46 (0.1%) |
| American Indian or Alaskan Native | 9 (0.2%) | 12 (0.2%) | 25 (0.4%) | 15 (0.2%) | 17 (0.3%) | 78 (0.2%) |
| Other | 45 (0.8%) | 98 (1.5%) | 98 (1.4%) | 163 (2.5%) | 307 (4.9%) | 711 (2.3%) |
| Unknown or chose not to disclose | 1247 (23.5%) | 1017 (15.9%) | 542 (7.9%) | 255 (3.9%) | 184 (3.0%) | 3245 (10.4%) |
| ASDa criteria | ||||||
| No. met ASD-RI criteriab | 69 | 163 | 294 | 278 | 252 | 1056 |
| Age met ASD-RI criteria, Median (IQR) | 9.7 (7.4, 14.3) | 10.3 (7.2, 13.1) | 8.8 (6.7, 12.0) | 7.5 (5.2, 10.4) | 6.7 (4.2, 9.4) | 8.1 (5.7, 11.3) |
| No. met ASD-RN criteriac | 23 | 55 | 135 | 146 | 175 | 533 |
| Age met ASD-RN criteria, Median (IQR) | 7.8 (5.8, 12.9) | 7.7 (5.9, 10.0) | 7.6 (5.2, 10.6) | 6.6 (4.6, 8.8) | 5.6 (3.7, 8.6) | 6.9 (4.4, 9.5) |
| No. met ASD-C criteriad | 6 | 14 | 53 | 65 | 104 | 242 |
| Age met ASD-C criteria, Median (IQR) | 15.3 (13.5, 16.7) | 12.8 (10.1, 16.0) | 10.4 (7.9, 14.1) | 7.0 (4.2, 12.0) | 5.4 (3.3, 8.4) | 7.5 (4.3, 12.4) |
| Follow-up | ||||||
| Age at last follow-up for individuals not meeting the ASD-RI criteria | ||||||
| Median (IQR) | 32.9 (22.2, 36.4) | 29.1 (22.4, 31.8) | 25.0 (21.9, 26.7) | 21.0 (19.4, 22.5) | 16.3 (14.9, 17.8) | 22.3 (17.6, 27.7) |
| Categorized, N (%) | ||||||
| 3 - <6 years | 306 (5.9%) | 286 (4.6%) | 376 (5.8%) | 366 (5.9%) | 399 (6.7%) | 1733 (5.7%) |
| 6 - <10 years | 202 (3.9%) | 189 (3.0%) | 246 (3.8%) | 217 (3.5%) | 257 (4.3%) | 1111 (3.7%) |
| 10 - <15 years | 154 (2.9%) | 188 (3.0%) | 160 (2.4%) | 154 (2.5%) | 911 (15.2%) | 1567 (5.2%) |
| 15 - <21 years | 435 (8.3%) | 529 (8.5%) | 626 (9.6%) | 2345 (37.9%) | 4413 (73.8%) | 8348 (27.7%) |
| 21+ years | 4132 (79.0%) | 5038 (80.9%) | 5129 (78.5%) | 3106 (50.2%) | 0 (0.0%) | 17405 (57.7%) |