.	k	g	CI	p	I2	CI	PI	NNT
Overall	26	-0.57	[-0.85; -0.28]	<0.001	76.39	[65.65; 83.76]	[-1.57; 0.43]	5.22
Combineda	17	-0.54	[-0.89; -0.18]	0.005	77.09	[63.64; 85.57]	[-1.64; 0.57]	5.56
One ES/study (lowest)b	14	-0.57	[-1; -0.13]	0.015	79.76	[66.82; 87.65]	[-1.78; 0.64]	5.22
One ES/study (highest)c	14	-0.47	[-0.84; -0.11]	0.015	73.91	[55.75; 84.62]	[-1.45; 0.5]	6.41
Outliers removedd	23	-0.46	[-0.63; -0.29]	<0.001	61.55	[39.55; 75.55]	[-1.11; 0.19]	6.64
Influence Analysise	24	-0.43	[-0.6; -0.27]	<0.001	63.91	[44.18; 76.66]	[-1.08; 0.22]	7.08
Only rob > 2f	13	-0.34	[-0.58; -0.11]	0.008	73.45	[53.91; 84.71]	[-1.1; 0.41]	9.12
Three-Level Modelg	26	-0.61	[-1.05; -0.17]	0.011	92.10	-	[-2.17; 0.96]	4.81
Three-Level Model (CHE)h	26	-0.55	[-0.92; -0.18]	0.007	88.00	-	[-1.8; 0.7]	5.42
Note:
Excluded effect sizes/studies:
a combined (arm-level): Ammerman, 2013 ; Ayen, 2004 cbt; Bowman, 1995 cognitive bibliotherapy; Brown, 1984 cbt group; Brown, 1984 cbt individual; Brown, 1984 cbt phone; Burford, 2021 ; Bzdok, 2001
b Ammerman, 2013 (cbt vs. cau; epds); Ammerman, 2013 (cbt vs. cau; hdrs); Ayen, 2004 (cbt vs. wl; bdi-1); Beach, 1992 (cbt vs. wl; bdi-1); Bowman, 1995 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; ces-d); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; ces-d); Buchanan, 2010 (cbt vs. cau; hdrs); Bruckner, 2009 (cbt vs. cau; hdrs)
c Ammerman, 2013 (cbt vs. cau; bdi-2); Ammerman, 2013 (cbt vs. cau; epds); Ayen, 2004 (cbt vs. wl; ids); Beach, 1992 (cbt vs. wl; bdi-1); Bowman, 1995 (cbt vs. wl; hdrs); Brown, 1984 (cbt vs. wl; ces-d); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; ces-d); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; ces-d); Burroughs, 1999 (cbt vs. cau; hdrs); Bzdok, 2001 (cbt vs. cau; hdrs)
d Ayen, 2004 (cbt vs. wl; bdi-1); Ayen, 2004 (cbt vs. wl; ids); Bzdok, 2001 (cbt vs. cau; hdrs)
e removed as influential cases: Ayen, 2004 (cbt vs. wl; bdi-1); Ayen, 2004 (cbt vs. wl; ids)
f Allart van Dam, 2003 (cbt vs. cau; bdi-1); Ayen, 2004 (cbt vs. wl; bdi-1); Ayen, 2004 (cbt vs. wl; ids); Beach, 1992 (cbt vs. wl; bdi-1); Beach, 1992 (cbt vs. wl; bdi-1); Bowman, 1995 (cbt vs. wl; bdi-1); Bowman, 1995 (cbt vs. wl; hdrs); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; ces-d); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; ces-d); Brown, 1984 (cbt vs. wl; bdi-1); Brown, 1984 (cbt vs. wl; ces-d)
g Number of clusters/studies: 14; robust variance estimation (RVE) used.
h Number of clusters/studies: 14; robust variance estimation (RVE) used.