Table 2.

Results of correlation between sample and intervention characteristics and the effectiveness, generalization and, maintenance of results.

The effect type	1 (Bi)	2(Bi)	3 (Bi)	4(Bi)	5(Bi)	6(Bi)	7(Chi)	8(Bi)	9(Bi)
E	0.18	0.24	0.12	−0.02	−0.08	0.04	0.95	0.17	0.19
E & G	0.08	−0.11	0.14	0.24	−0.03	−0.23	0.07	0.05	−0.27
E & G & M	−0.08	−0.05	−0.07	−0.2	0.48	0.73	0.67	0.28	0

Bi = bi-serial; E = effectiveness; G = generalization; M = maintenance; 1 = number of groups; 2 = total sample size; 3 = Age range; 4 = IQ; 5 = Number of sessions; 6 = duration of intervention; 7 = Parental involvement; 8 = Repeatability of sessions in a week; 9 = Sample size in per group.