Table 2.

Meta-regression of study characteristics on log odds ratio for response

Variable	Coefficient	95% confidence interval	P value	Residual I 2
Dosea	0.01	−0.02 to 0.04	0.46	67%
Unpublished	−0.44	−1.04 to 0.16	0.13	74%
Poor quality	0.44	−0.57 to 1.45	0.35	77%
Poor quality or unpublished study	−0.23	−0.84 to 0.38	0.42	78%
Non-US-based study	−0.70	−1.02 to -0.35	0.001	24%
Duration 8 weeks (vs 6 weeks)	0.10	−0.29 to 0.48	0.58	77%
Baseline MADRS score	−0.11	−0.33 to 0.11	0.29	75%
Proportion of study participants non-White	−0.04	−0.05 to -0.02	<0.001	0%

^aPlacebo arm partitioned for multi-arm trial.