Table 1.

Descriptive characteristics of children with intellectual disability (ID; n=423).

	% (95% CI)
Outcome measures
Depression	15.4 (9.0, 21.8)
Anxiety problems	33.9 (24.8, 43.1)
Sociodemographic variables
Age
6-11 years	37.7 (27.7, 47.7)
12-17 years	62.3 (52.3, 72.3)
Male	63.3 (51.7, 74.9)
Race
Non-Hispanic White	48.1 (37.5, 58.7)
Non-Hispanic Black	19.6 (11.4, 27.8)
Hispanic	26.2 (13.3, 39.1)
Other	6.1 (3.5, 8.7)
Household poverty status
0-199%	53.5 (42.6, 64.4)
200-399%	25.0 (14.4, 35.7)
≥400%	21.4 (13.7, 29.2)
Severity of ID and comorbid conditions
Severity of ID
Mild	36.0 (24.3, 47.8)
Moderate or severe	64.0 (52.2, 75.7)
Autism spectrum disorders	42.0 (31.9, 52.2)
Epilepsy	16.6 (9.6, 23.6)
Cerebral palsy	12.7 (5.7, 19.6)
Down syndrome	10.0 (5.1, 14.9)
ADHD	39.6 (29.7, 49.5)
Physical and social factor variables
Physical activity ≥60 minutes
0 days	31.6 (19.8, 43.3)
1-3 days	35.6 (25.2, 45.9)
4-7 days	32.9 (23.8, 41.9)
Sleeps < age-appropriate hours	36.8 (27.1, 46.6)
Pain	22.2 (13.7, 30.6)
Participation in activities	47.5 (36.6, 58.3)
Bully victimization	59.1 (48.8, 69.4)

ADHD, attention-deficit/hyperactivity disorder; CI, confidence interval.