. Author manuscript; available in PMC: 2013 Jun 1.

Published in final edited form as: J Am Acad Child Adolesc Psychiatry. 2012 Apr 24;51(6):622–631. doi: 10.1016/j.jaac.2012.03.001

Table 2.

Descriptive statistics and intercorrelations among study variables for autism sample.

	Time 1 W-ADL	Time 4 W-ADL	Time 7 W-ADL	Time 8 W-ADL	Child Age	ID Status
Time 1	1 (n = 385)
W-ADL
Time 4	.85^***	1
W-ADL	(n = 267)	(n = 278)
Time 7	.81^***	.90^***	1
W-ADL	(n = 235)	(n = 228)	(n = 245)
Time 8	.78^***	.87^***	.94^***	1
W-ADL	(n = 221)	(n = 217)	(n = 216)	(n = 230)
Child Age	.16**	−.04	−.09	−.09	1
	(n = 385)	(n = 278)	(n = 245)	(n = 230)	(n = 397)
ID Status	−.45^***	−.58^***	−.62^***	−.61^***	.23^***	1
	(n = 385)	(n = 278)	(n = 245)	(n = 230)	(n = 397)	(n = 397)
M/SD	19.62 (6.65)	20.66 (7.51)	20.53 (7.87)	20.59 (8.08)	21.84 (9.32)	.70 (.46)
Range	3–34	2–34	1–34	3–34	10–52	0–1

Note: ID = intellectual disability; W-ADL = Waisman Activities of Daily Living

^***

p < .001