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Table 1 Characteristics of the participants by sex

From: National survey of the association of depressive symptoms with the number of off duty and on-call, and sleep hours among physicians working in Japanese hospitals: a cross sectional study

  Men   Women  
  (n = 3,025) (%) (n = 837) (%)
Age (years)
   24-29 38 (1.3) 51 (6.1)
   30-39 417 (13.7) 300 (35.8)
   40-49 876 (29.0) 270 (32.3)
   50-59 967 (32.0) 141 (16.8)
   60-69 464 (15.3) 55 (6.6)
   70 or more 263 (8.7) 20 (2.4)
The number of days of off-duty per month
   None 299 (9.9) 70 (8.4)
   1-4 days 1203 (39.8) 279 (33.3)
   5-7 days 986 (32.6) 222 (26.5)
   8 days or more 537 (17.7) 266 (31.8)
The number of days of on-call per month
   None 1338 (44.2) 476 (56.9)
   1-4 days 669 (22.1) 149 (17.8)
   5-7 days 379 (12.5) 59 (7.0)
   8 days or more 639 (21.1) 153 (18.3)
Average sleeping hours for days not working overnight
   Less than 5 hours 263 (8.7) 83 (9.9)
   5 to less than 6 hours 977 (32.3) 290 (34.6)
   6 to less than 7 hours 1390 (46.0) 366 (43.7)
   7 hours or more 395 (13.0) 98 (11.8)
The number of days of overnight work per month
   None 1261 (41.7) 480 (57.3)
   Once 288 (9.5) 59 (7.0)
   2 to 3 times 598 (19.8) 136 (16.2)
   4 to 5 times 529 (17.5) 97 (11.6)
   6 times or more 349 (11.5) 65 (7.8)
Score of the quick inventory depressive scale
   0-5 2054 (67.9) 550 (65.7)
   6-10 719 (23.8) 199 (23.8)
   11-15 199 (6.5) 66 (7.9)
   16-20 41 (1.4) 18 (2.2)
   21-27 12 (0.4) 4 (0.5)