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BP categories and total physical activities for each time period (A) 00:00–03:00 (B) 03:00–06:00 (C) 06:00–09:00 (D) 09:00–12:00 (E) 12:00–15:00 (F) 15:00–18:00 (G) 18:00–21:00 (H) 21:00–24:00 (I) Irregular timing*p < 0.05, **p < 0.01 (Tukey).
