Age-dependent changes in the association between sleep duration and impaired glucose metabolism

Figure 1 Sleep duration according to age groups and sex. Each point and vertical bar represent the mean ± 1.96 SE. Sleep duration in men and women increased with increasing age (both P < 0.0001, ANOVA). Significant differences were observed in sleep duration between men and women in all age groups (all P < 0.0001, except for P = 0.003 in the 20s, t-test). The corresponding number of subjects is shown in the side of the bar.