TABLE 5. Median age at earliest known autism spectrum disorder diagnosis, by intellectual disability status — Autism and Developmental Disabilities Monitoring Network, 11 sites, United States, 2016.
| Site/Characteristic | No. with ASD | All children with an ASD diagnosis* |
Children with an ASD diagnosis and IQ ≤70 |
Children with an ASD diagnosis and IQ >70 |
|||
|---|---|---|---|---|---|---|---|
| No. | Median age (mos) at diagnosis | No. | Median age (mos) at diagnosis | No. | Median age (mos) at diagnosis | ||
|
Site
| |||||||
| Arizona |
282 |
193 |
57.0 |
45 |
51.0 |
127 |
59.0 |
| Arkansas |
606 |
489 |
56.0 |
204 |
49.0 |
267 |
63.0 |
| Colorado |
537 |
362 |
48.5 |
105 |
43.0 |
187 |
54.0 |
| Georgia |
456 |
306 |
55.0 |
116 |
50.5 |
138 |
60.0 |
| Maryland |
192 |
150 |
47.5 |
39 |
37.0 |
60 |
53.0 |
| Minnesota |
313 |
170 |
56.0 |
40 |
51.5 |
112 |
60.0 |
| Missouri |
213 |
194 |
56.0 |
13 |
68.0 |
37 |
71.0 |
| New Jersey |
1,036 |
844 |
51.0 |
162 |
44.0 |
431 |
53.0 |
| North Carolina |
489 |
280 |
38.0 |
95 |
30.0 |
156 |
49.0 |
| Tennessee |
405 |
307 |
51.0 |
112 |
41.5 |
142 |
59.0 |
| Wisconsin |
579 |
469 |
49.0 |
128 |
42.0 |
173 |
59.0 |
|
Characteristic
| |||||||
| Sex | |||||||
| Female |
938 |
649 |
51.0 |
211 |
43.0 |
281 |
56.0 |
| Male |
4,170 |
3,115 |
51.0 |
848 |
45.0 |
1,549 |
57.0 |
| Race/Ethnicity | |||||||
| Non-Hispanic white |
2,613 |
1,950 |
51.0 |
468 |
42.0 |
1,064 |
58.0 |
| Non-Hispanic black |
1,070 |
781 |
53.0 |
295 |
48.0 |
283 |
57.0 |
| Hispanic |
909 |
674 |
51.0 |
196 |
44.0 |
310 |
55.0 |
| Total | 5,108 | 3,764 | 51.0 | 1,059 | 44.0 | 1,830 | 57.0 |
Abbreviations: ASD = autism spectrum disorder; IQ = intelligence quotient.
* Children with unknown IQ are included in the “all children with an ASD diagnosis” category but not the IQ-specific strata.