TABLE 1.
Demographic Characteristics From Swedish Medical Birth Registry and Statistics Sweden
| Autism Spectrum Disorder (n = 1237) No. (%) |
Controls (n = 30,925) No. (%) |
|
|---|---|---|
| Maternal age (years) | ||
| <25 | 327 (27) | 8485 (28) |
| 26–30 | 414 (34) | 11,450 (37) |
| 31–35 | 317 (26) | 7511 (24) |
| 36–40 | 146 (12) | 2783 (9) |
| 41–50 | 23 (2) | 464 (2) |
| Paternal age (years) | ||
| <25 | 128 (10) | 4407 (14) |
| 26–30 | 346 (28) | 9846 (32) |
| 31–35 | 385 (32) | 9136 (30) |
| 36–40 | 226 (18) | 4759 (16) |
| 41–50 | 125 (10) | 2345 (8) |
| >50 | 17 (1) | 200 (1) |
| Maternal country of origin | ||
| Nordic countries | 1029 (84) | 27,588 (90) |
| Europe and North America | 59 (5) | 1364 (4) |
| Africa | 42 (3) | 403 (1) |
| Asia | 77 (6) | 1016 (3) |
| South America | 18 (1) | 254 (1) |
| Other | 2 (0.2) | 68 (0.2) |
| Paternal country of origin | ||
| Nordic countries | 1013 (83) | 27,136 (88) |
| Europe and North America | 66 (5) | 1622 (5) |
| Africa | 49 (4) | 514 (2) |
| Asia | 82 (7) | 1094 (4) |
| South America | 17 (1) | 282 (1) |
| Other | 0 | 45 (0.1) |
| Sex of child | ||
| Boy | 939 (77) | 23,478 (76) |
| Girl | 288 (23) | 7215 (24) |
| Age at diagnosis/reference (years) | ||
| 1 | 12 (1) | 300 (1) |
| 2 | 62 (5) | 1562 (5) |
| 3 | 0 (14) | 4161 (14) |
| 4 | 240 (20) | 6012 (20) |
| 5 | 213 (17) | 5286 (17) |
| 6 | 158 (13) | 3947 (13) |
| 7 | 148 (12) | 3693 (12) |
| 8 | 88 (7) | 2258 (7) |
| 9 | 94 (8) | 2335 (8) |
| 10 | 44 (4) | 1139 (4) |
| Diagnosis | ||
| ICD-10 (diagnosed before 1998) | 776 (63) | |
| ICD-10 (diagnosed in or after 1998) | 451 (37) |