TABLE 5. Median age of earliest known autism spectrum disorder diagnosis and number and proportion within each diagnostic subtype — Autism and Developmental Disabilities Monitoring Network, 11 sites, United States, 2012.
| Site | ASD
subtype |
|||||||
|---|---|---|---|---|---|---|---|---|
| Autistic disorder |
ASD-NOS/PDD-NOS |
Asperger disorder |
Any
ASD subtype |
|||||
| Median age (mos) | No. (%) | Median age (mos) | No. (%) | Median age (mos) | No. (%) | Median age (mos) | No. (%) | |
| Arizona | 50.0 | 254 (74.5) | 64.0 | 72 (21.1) | 77.0 | 15 (4.4) | 55.0 | 341 (69.0) |
| Arkansas | 53.0 | 97 (72.9) | 60.0 | 20 (15.0) | 77.5 | 16 (12.0) | 60.0 | 133 (78.2) |
| Colorado | 48.0 | 184 (66.2) | 59.0 | 55 (19.8) | 80.0 | 39 (14.0) | 55.0 | 278 (63.8) |
| Georgia | 47.5 | 262 (48.0) | 51.0 | 231 (42.3) | 71.0 | 53 (9.7) | 51.0 | 546 (70.8) |
| Maryland* | 41.0 | 56 (40.6) | 48.0 | 79 (57.2) | 44.0 | 3 (2.2) | 45.5 | 138 (79.3) |
| Maryland† | 46.5 | 44 (33.5) | 44.5 | 72 (58.1) | 44.0 | 8 (6.4) | 48.0 | 124 (83.8) |
| Missouri | 50.0 | 67 (26.1) | 51.0 | 145 (56.4) | 78.0 | 45 (17.5) | 58.0 | 257 (86.5) |
| New Jersey | 44.5 | 192 (29.7) | 43.0 | 378 (58.4) | 74.0 | 77 (11.9) | 47.0 | 647 (80.9) |
| North Carolina | 37.0 | 207 (53.6) | 55.5 | 156 (40.4) | 72.0 | 23 (6.0) | 48.0 | 386 (58.8) |
| South Carolina | 45.0 | 143 (65.0) | 58.0 | 70 (31.8) | 74.0 | 7 (3.2) | 48.0 | 220 (72.8) |
| Utah | 45.0 | 114 (31.7) | 48.0 | 178 (49.4) | 63.5 | 68 (18.9) | 50.0 | 360 (83.5) |
| Wisconsin |
45.5 |
106 (34.8) |
49.0 |
173 (56.7) |
74.0 |
26 (8.5) |
50.0 |
305 (79.4) |
| Total | 46.0 | 1,726 (46.2) | 49.0 | 1,629 (43.6) | 74.0 | 380 (10.2) | 50.0 | 3,735 (73.8) |
Abbreviations: ASD-NOS = autism spectrum disorder–not otherwise specified; PDD-NOS = pervasive developmental disorder–not otherwise specified.
*Education and health records review area.
†Health records only review area.