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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