TABLE 1.

Comparison of Characteristics of Adolescents with Autism by Intellectual Ability Status (n = 1787): ADDM Network, 5 sites, United States, 2020

Category	Characteristic	Total	Known Intellectual Ability Statusa	Intellectual Disability	Prevalence Ratio
		(n)	(n)	% (n)	(95% CI)
Sex	Female	322	238	39.5% (94)	1
	Male	1465	1101	32.2% (355)	0.82 (0.68–0.98)
Race/ethnicity	White	1124	823	27.5% (226)	1
	Black	337	284	50.7% (144)	1.85 (1.57–2.17)
	American Indian or Alaskan Native	8	6	0.0% (0)
	Asian or Pacific Islander	53	43	44.2% (19)	1.61 (1.13–2.29)
	Other race or multiple races	70	52	32.7% (17)	1.19 (0.79–1.79)
	Hispanic regardless of race	176	127	32.3% (41)	1.18 (0.89–1.55)
Adaptive functioning statusb	No adaptive impairment	416	386	18.4% (71)	1
	Adaptive impairment	578	531	59.1% (314)	3.21 (2.58–4.01)
Site	Arkansas	135	119	37.8% (45)	1
	Georgia	335	295	41.0% (121)	1.09 (0.83–1.42)
	Maryland	335	265	34.7% (92)	0.92 (0.69–1.22)
	Utah	571	428	22.9% (98)	0.61 (0.45–0.81)
	Wisconsin	411	232	40.1% (93)	1.06 (0.81–1.40)
First identification period	9–16 y	255	198	25.8% (51)	1
	≤8 y	1532	1141	34.9% (398)	1.35 (1.06–1.74)
Total	Total	1787	1339	33.5% (449)

CI, confidence interval.

^aIntellectual ability based on most recently available IQ score (≤70) or examiner’s report.

^bAdaptive functioning based on most recently available adaptive score (≤70) or examiner’s report.