Table 1.

Participants' characteristics and group differences at pre‐test

Variable	Intervention (n = 60)		Control (n = 59)		Total (N = 119)		Statistics
	n	%	n	%	N	%	t
Gender							t(117) = −.08, P = 0.94
Male	35	58.3	34	57.6	69	58
Female	25	41.7	25	42.4	50	42
TIQ − M (SD)	66.9 (10.03)		65.9 (9.08)		66.4 (9.54)		t(117) = −0.56, P = 0.58
Age − M (SD)	15.9 (2.25)		15.8 (2.22)		15.8 (2.23)		t(117) = −0.38, P = 0.70
Age groups							t(117) = −0.34, P = 0.74
Early ad (<15 yrs)	22	36.7	24	40.7	46	38.7
Mid‐late ad (>15 yrs)	38	63.3	35	59.3	73	61.3
Level of ID							t(117) = −0.34, P = 0.74
Mild ID	41	68.3	42	71.2	83	69.7
Borderline IF	19	31.7	17	28.8	36	30.3
Co‐morbidity	53	88.3	57	96.6	110	92.4
Physical disability	36	67.9	41	71.9	77	70.0	t(117) = .43, P = 0.67
Psychiatric problem	5	9.4	8	14.0	13	11.8	t(117) = −0.15, P = 0.88
Multiple	12	22.6	8	14.0	20	18.2	t(117) = −0.94, P = 0.35

Abbreviations: ad, adolescence; yrs, years; ID, intellectual disability; IF, intellectual functioning.

Multiple = physical disability and psychiatric problem.