Figure 2From: Sleep architecture and cognitive changes in olanzapine-treated patients with depression: A double blind randomized placebo controlled trial Sleep continuity. A) Total sleep time B) Sleep efficiency. Mean ± standard error of the mean for both olanzapine- and placebo-treated groups. Total sleep time is measured in minutes. Sleep efficiency: % = total sleep time(TST)/time in bed (TIB)× 100. *p < .05 between placebo and olanzapine groups on Day 28–31.Back to article page