Comparison 2. Length of treatment.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Remission	10		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
1.1 6 to 8 weeks	6	327	Risk Ratio (M‐H, Random, 95% CI)	0.86 [0.79, 0.94]
1.2 More than 8 weeks	4	497	Risk Ratio (M‐H, Random, 95% CI)	0.91 [0.84, 0.99]
2 Clinical Improvement	8		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
2.1 6 to 8 weeks	6	481	Risk Ratio (M‐H, Random, 95% CI)	0.63 [0.51, 0.77]
2.2 More than 8 weeks	2	420	Risk Ratio (M‐H, Random, 95% CI)	0.53 [0.23, 1.20]