Table 1.
Characteristics by diagnosis
| ASD n = 173 n (%) | Non-ASD n = 51 853 n (%) | ||
|---|---|---|---|
| Infant sex | Male | 150 (86.7) | 26 447 (51.0) |
| Female | 23 (13.3) | 25 406 (49.0) | |
| Maternal education (years) | <12 | 10 (5.8) | 2 700 (5.2) |
| 12 | 55 (31.8) | 12 331 (23.8) | |
| 13-16 | 67 (38.7) | 21 971 (42.4) | |
| ≥17 | 35 (20.2) | 13 482 (26.0) | |
| Missing | 6 (3.5) | 1 369 (2.6) | |
| Maternal age (years) | <25 | 21 (12.1) | 4 756 (9.2) |
| 25-29 | 50 (28.9) | 16 915 (32.6) | |
| 30-34 | 71 (41.0) | 20 776 (40.1) | |
| ≥35 | 31 (17.9) | 9 406 (18.1) | |
| Parity | 0 | 100 (57.8) | 24 932 (48.1) |
| 1 | 45 (26.0) | 17 730 (34.2) | |
| ≥2 | 28 (16.2) | 9 191 (17.7) | |
| Year of birth | 2003 | 25 (14.5) | 2 608 (5.0) |
| 2004 | 39 (22.5) | 9 098 (17.5) | |
| 2005 | 32 (18.5) | 10 190 (19.7) | |
| 2006 | 34 (19.7) | 11 126 (21.5) | |
| 2007 | 22 (12.7) | 10 293 (19.9) | |
| 2008 | 21 (12.1) | 8 538 (16.5) | |