Figure 2.

Forest plot of blinding successfulness among (A) patients and (B) assessors in antidepressants trials. κ value: -0.20 to 0.20 as successful blinding, 0.21 to 0.40 as slightly broken, 0.41 to 0.60 as moderately broken, 0.61 to 1 as severely broken. The width of diamond is the 95% confidence interval of the summary kappa, and the dashed line shows the prediction interval. τ²: tau² measure of between-study variance. One study in 1997 was included because the secondary analysis on blinding assessment was published in 2000.