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 |
253 (74.4) |
64.0 |
72 (21.2) |
77.0 |
15 (4.4) |
55.0 |
340 (68.8) |
| Arkansas |
57.0 |
73 (76.0) |
60.0 |
12 (12.5) |
84.0 |
11 (11.5) |
60.0 |
96 (76.8) |
| Colorado |
48.0 |
184 (66.2) |
59.0 |
55 (19.8) |
80.0 |
39 (14.0) |
55.0 |
278 (63.8) |
| Georgia |
47.5 |
261 (48.0) |
51.0 |
230 (42.2) |
71.0 |
53 (9.7) |
51.0 |
544 (70.6) |
| 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 (35.5) |
44.5 |
72 (58.1) |
74.0 |
8 (6.5) |
48.0 |
124 (83.8) |
| Missouri |
50.0 |
67 (26.0) |
51.0 |
145 (56.2) |
77.5 |
46 (17.8) |
58.0 |
258 (86.0) |
| New Jersey |
45.0 |
193 (29.7) |
43.0 |
380 (58.5) |
74.0 |
77 (11.8) |
47.0 |
650 (80.9) |
| North Carolina |
36.5 |
206 (53.6) |
55.0 |
155 (40.4) |
72.0 |
23 (6.0) |
48.0 |
384 (58.8) |
| South Carolina |
45.0 |
143 (65.6) |
58.5 |
68 (31.2) |
74.0 |
7 (3.2) |
48.0 |
218 (72.2) |
| 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 | 1,700 (46.0) | 49.0 | 1,619 (43.8) | 74.0 | 376 (10.2) | 50.0 | 3,695 (73.6) |
Abbreviations: ASD = autism spectrum disorder; 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.