Table 2.
Basic attributes of the subjects (n = 8264).
| Age at diagnosis in years | |
| Modal age | 3.0 |
| Median (25th–75th percentile) | 6.0 (4.0–10.0) |
| Mean ± SD | 7.2 ± 4.2 |
| Sex n (%) | |
| Male | 6285 (76.1) |
| Female | 1979 (23.9) |
| Autism spectrum disorder†1 n (%) | |
| Childhood autism | 2778 (33.6) |
| Atypical autism | 241 (2.9) |
| Asperger's syndrome | 773 (9.4) |
| Other pervasive developmental disorder | 56 (0.7) |
| Pervasive developmental disorder, unspecified | 3931 (47.6) |
| Dual and multiple diagnosis | 485 (5.9) |
| Medical facilities n (%) | |
| National hospital, public hospital | 1989 (24.1) |
| University hospital | 392 (4.7) |
| Other hospital | 1509 (18.3) |
| Medical office | 4374 (52.9) |
| Diagnosis and treatment department n (%) | |
| Paediatrics | 2991 (36.2) |
| Neuropsychiatry | 2368 (28.7) |
| Internal medicine | 2025 (24.5) |
| Orthopedics | 167 (2.0) |
| Obstetrics and gynecology | 114 (1.4) |
| Otolaryngology | 46 (0.6) |
| Radiology | 44 (0.5) |
| Ophthalmology | 38 (0.5) |
| Neurosurgery | 22 (0.3) |
| Urology | 17 (0.2) |
| Others | 432 (5.2) |
†1Subtype of PDD using the first date of diagnosis (exclusion of RS).