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Table 1 Participant characteristics (n = 1241)

From: The relationship between long working hours and depression among first-year residents in Japan

Age, mean ± SD, y 26.0 ± 2.9
Male Sex, n (%) 812 (65.4%)
Hospital type
 University hospital, n (%) 495 (39.9%)
 Other teaching hospital, n (%) 746 (60.1%)
Mean number of work hours per week, mean ± SD 79.4 ± 15.0
 on weekdays, mean ± SD 12.2 ± 2.3
 on weekends, mean ± SD 4.3 ± 3.2
 80 or more hours of work per week, n (%) 554 (44.6%)
 100 or more hours of work per week, n (%) 97 (7.8%)
Mean number of hours for sleep per day, mean ± SD 5.8 ± 0.9
 Less than 6 h for sleep per day, n (%) 409 (33.0%)
Mean duration of disposable time per day, mean ± SD, hours/day 2.8 ± 1.6
 Less than 2 h of free time, n (%) 244 (19.7%)
Number of night shifts per month, n (%) 3.6 ± 2.1
Working schedule after night shifts (n = 1065)
 No change, n (%) 726 (68.2%)
 Shorter working day, n (%) 291 (27.3%)
 Rest day, n (%) 48 (4.5%)
Mean number of days off work per month, mean ± SD 4.7 ± 3.9
Number of calls during overtime duty per month, mean ± SD 3.0 ± 6.1