Figure 2.

Sleep stages were divided into stages: 1, 2, 3+4, and REM. Stage 1 ranged from 2.5% to 87.1% (mean 22.4%) in Ménière's disease and 1.9% to 53.9% (mean 20.7%) in controls (not significant). Stage 2 ranged from 14.2% to 83.2% (mean 58.7%) in Ménière's disease and was significantly higher (p < 0.01) than controls (23.7% to 77.6%, mean 50.7%). Stage 3+4 ranged from 0.3% to 13.1% (mean 2.8%) in Ménière's disease and was significantly lower (p < 0.01) than controls (0.3% to 46.6%, mean 10%). REM ranged from 6.3% to 40.1% (mean 16.5%) in Ménière's disease and was not significantly different from controls (7.8% to 28.9%, mean 18.5%). Error bar = standard deviation.