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Table 1 Demographic characteristics and lifestyle data of the participants

From: Impact of sleep problems on daytime function in school life: a cross-sectional study involving Japanese university students

  n = 1034
Age (y) 19.7 ± 1.2
Sex
 Male n (%) 225 (21.8)
 Female n (%) 809 (78.2)
Grade
 Freshman n (%) 369 (35.7)
 Sophomore n (%) 236 (22.8)
 Junior n (%) 280 (27.1)
 Senior n (%) 147 (14.2)
 N/A n (%) 2 (0.2)
Living alone
 Yes n (%) 218 (21.1)
 No n (%) 703 (68.0)
 N/A n (%) 113 (10.9)
Commute time (min) 59.6 ± 33.9
School hours (h) 6.9 ± 1.8
Class start time (h:m) 9:19 ± 0:46
Class closing time (h:m) 16:15 ± 1:37
Club activities
 Yes n (%) 402 (38.9)
 No n (%) 613 (59.3)
 N/A n (%) 19 (1.8)
Part-time job
 Yes n (%) 686 (66.3)
 No n (%) 333 (32.2)
 N/A n (%) 15 (1.5)
Exercise habit
 Yes n (%) 499 (48.3)
 No n (%) 519 (50.2)
 N/A n (%) 16 (1.5)
Alcohol consumption
 Yes n (%) 437 (42.3)
 No n (%) 584 (56.5)
 N/A n (%) 13 (1.3)
Smoking
 Yes n (%) 54 (5.2)
 No n (%) 967 (93.5)
 N/A n (%) 13 (1.3)
Self-rated health status
 Good n (%) 740 (71.6)
 Poor n (%) 279 (27.0)
 N/A n (%) 15 (1.5)
Stress
 No n (%) 554 (53.6)
 Yes n (%) 465 (45.0)
 N/A n (%) 15 (1.5)
  1. Values are expressed as mean ± standard deviation for continuous variables
  2. N/A Unanswered