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Table 2 Number (%) of subjects in each irregular bedtime frequency group with an average daily sleep time <7 h/day, 7–8 h/day, or >8 h/day

From: Effects of an irregular bedtime schedule on sleep quality, daytime sleepiness, and fatigue among university students in Taiwan

ADST* Irregular bedtime frequency+ Total
  Low Intermediate High  
<7 h/day 14 (8.8) 26 (16.3) 35 (21.9) 75 (46.9)
7–8 h/day 17 (10.6) 24 (15.0) 10 (6.3) 51 (31.9)
>8 h/day 12 (7.5) 12 (7.5) 10 (6.3) 34 (21.3)
Total 43 (26.9) 62 (38.8) 55 (34.4) 160 (100)
  1. ADST, average daily sleep time
  2. + An irregular bedtime event was defined as a shift from the usual bedtime of >1 h. This occurred <1 night/week for the low-frequency group, 1–3 nights/week for the intermediate-frequency group, and >3 nights/week for the high-frequency group.
  3. *Chi-Square analysis indicated that average daily sleep time differed significantly across the irregular bedtime frequency groups (χ2 = 11.68, p = 0.022); as supported by a significant Spearman correlation (r = -0.22, p = 0.05).