Table 2.

Results of subgroup analysis of depression.

Subgroups	I 2	Studies (n)	Participants (n)	SMD	95% CI	P (overall effects)	P (group differences)
Form of intervention							P = 0.02
Individual sessions	0%	2	119	−1.21	−1.60, −0.81	P < 0.00001
Group sessions	74%	10	592	−0.58	−0.93, −0.23	P = 0.001
Duration of intervention							P = 0.06
<8weeks	77%	4	186	−0.75	−1.41, −0.08	P = 0.03
=8weeks	0%	3	211	−1.14	−1.43, −0.84	P < 0.00001
>8weeks	36%	5	314	−0.51	−0.84, −0.18	P = 0.003
Setting of intervention							P = 0.02
Care home	63%	9	511	−0.60	−0.92, −0.28	P = 0.0003
Community	0%	3	200	−1.12	−1.42, −0.82	P < 0.00001

I², heterogeneity; SMD, standardized mean difference.