Figure 2From: Olanzapine is superior to lamotrigine in the prevention of bipolar depression: a naturalistic observational study Time to recurrence into depressive episode: Kaplan-Meier survival curves. The olanzapine group had a significantly longer time to recurrence into depressive episode than the lamotrigine group (χ2 = 4.55, df = 1, p = .033, log-rank test).Back to article page