Figure 1.
MSLT (mean ± SE) at 9, 11, 13, 15, and 17 h, in young (•), middle-aged (○), and older subjects (▼). *P < 0.05; **P < 0.01; P < 0.001. Y vs. O = Young vs. Older; Y vs. M = Young vs. Middle-aged; M vs. O = Middle-aged vs. Older
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