Bauer and Do"pfmer (1999) examined the efficacy of lithium as an augmentation to conventional antidepressants. They found nine placebo-controlled studies testing lithium for those cases that did not respond to other antidepressants. The data, as estimated from their paper, follow:

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Study n d Sd Stein 34 -0.30 0.82 Cl -1.10-0.50 Zusky 16 0.19 0.86 -0.65 -1.03 Katona 61 0.50 0.51 0.02-1.02 Schopf 27 1.36 1.39 0.05 -2.77 Baumann 24 0.97 0.99 0.09 -1.85 Browne 17 0.51 0.87 -0.34-1.36 Kantor 7 0.51 1.55 -1.01 -2.03 Heninger 15 1.33 1.38 -0.02 -2.68 Joffe 33 0.76 0.70 -0.02 -1.36 Create a forest plot for these results.