Table 1

Characteristics of the participants by sex

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)


Wada et al. BMC Public Health 2010 10:127   doi:10.1186/1471-2458-10-127

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