Research Article
The Age at Diagnosis of Autism Spectrum Disorder in Children in Japan
Table 2
Basic attributes of the subjects
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| 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 (%) | | Male | 6285 (76.1) | Female | 1979 (23.9) | Autism spectrum disorder†1 (%) | | 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 (%) | | 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 (%) | | 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) |
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Subtype of PDD using the first date of diagnosis (exclusion of RS). |