Table 3.

Summary of meta-analytic studies evaluating psychological and behavioral treatments

Reference	Time period reviewed	Number of studies reviewed	Total sample
30	1974–1993	59	2201
33	1973–1993	66	1907
31	1966–1998	13	308
34	1966–2002	6	274
32	1966–2004	23	–
29	1998–2004	37	2246