Table 1.
Prevalence of ASD and ASD-like traits measured by the A-TAC by sex, zygosity, and birth weight category (grams), independent of twin status for the full sample (N=5,561).
| Sex | ASD | Restricted/ Repetitive |
Language | Social | ||
|---|---|---|---|---|---|---|
| BW (g) | N | n (%) | n (%) | n (%) | n (%) | |
| Males | ≤1,499 | 249 | 8 (3.2) | 38 (15.3) | 37 (14.9) | 5 (2.0) |
| 1,500–2,499 | 1751 | 40 (2.3) | 219 (12.5) | 220 (12.6) | 32 (1.8) | |
| 2,500–3,499 | 3178 | 69 (2.2) | 319 (10.0) | 309 (9.7) | 52 (1.6) | |
| ≥3,500 | 426 | 5 (1.2) | 37 (8.6) | 43 (10.0) | 6 (1.4) | |
| Missing BW | 88 | |||||
| Females | ≤1,499 | 256 | 6 (2.3) | 22 (8.5) | 27 (10.5) | 5 (2.0) |
| 1,500–2,499 | 1916 | 19 (1.0) | 106 (5.5) | 103 (5.4) | 21 (1.1) | |
| 2,500–3,499 | 2920 | 16 (0.6) | 146 (5.0) | 116 (4.0) | 18 (0.6) | |
| ≥3,500 | 227 | 0 (0.0) | 6 (2.6) | 10 (4.4) | 0 (0.0) | |
| Missing BW | 111 | |||||
| Zygosity MZ | ≤1,499 | 160 | 3 (1.9) | 20 (12.5) | 21 (13.1) | 3 (1.3) |
| 1,500–2,499 | 1175 | 16 (1.4) | 76 (6.5) | 114 (9.7) | 21 (1.8) | |
| 2,500–3,499 | 1716 | 19 (1.1) | 106 (6.2) | 130 (7.6) | 16 (0.9) | |
| ≥3,500 | 139 | 1 (0.7) | 5 (3.6) | 14 (10.0) | 0 (0.0) | |
| Missing BW | 76 | |||||
| DZ1 | ≤1,499 | 279 | 8 (2.9) | 32 (11.4) | 33 (11.7) | 5 (1.8) |
| 1,500–2,499 | 2167 | 38 (1.8) | 221 (10.2) | 186 (8.6) | 28 (1.3) | |
| 2,500–3,499 | 3831 | 57 (1.5) | 311 (8.1) | 248 (6.5) | 49 (1.3) | |
| ≥3,500 | 457 | 3 (0.7) | 34 (7.4) | 33 (7.2) | 5 (1.1) | |
| Missing BW | 106 | |||||
| Unknown | ≤1,499 | 66 | 3 (4.6) | 8 (12.1) | 10 (15.2) | 3 (4.6) |
| 1,500–2,499 | 325 | 5 (1.5) | 28 (8.6) | 23 (7.0) | 4 (1.2) | |
| 2,500–3,499 | 551 | 9 (1.6) | 48 (8.7) | 47 (8.5) | 5 (0.9) | |
| ≥3,500 | 57 | 1 (1.8) | 4 (7.0) | 6 (10.5) | 1 (1.8) | |
| Missing BW | 17 |
BW=Birth weight; N= total number of individuals; n= number of individuals meeting cut-off criteria for ASD or ASD-like traits; (%) = percentage meeting cut-offs on the A-TAC;
1
DZ includes both same-sex and opposite-sex twin-pairs