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

Figure 2 HbA1c levels according to age groups divided by decades. Each point and vertical bar represent the mean ± 1.96 SE. HbA1c levels in men and women increased with increasing age (both P < 0.0001, ANOVA). Significant differences were observed in HbA1c levels between men and women in all age groups (all P < 0.0001, t-test). The corresponding number of subjects is the same as that in Figure 1.