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Table 1 General and occupational characteristics

From: Association between long working hours and serum gamma-glutamyltransferase levels in female workers: data from the fifth Korean National Health and Nutrition Examination Survey (2010-2011)

Variables

Total

Weekly working hours

P-value

≤29 N (%*)

30–51 N (%*)

≥52 N (%*)

Total

1,809 (100.0)

400 (21.0)

1,054 (57.8)

355 (21.2)

 

Age (years)

     

 20-39

1,150 (65.0)

256 (64.8)

691 (67.5)

203 (58.6)

0.039

 40-49

659 (35.0)

144 (35.2)

363 (32.5)

152 (41.4)

 

BMI (kg/m2)

     

 Underweight (<18.5)

182 (10.8)

38 (10.3)

120 (12.2)

24 (7.4)

0.172

 Normal (18.5–22.9)

1,307 (71.1)

290 (70.6)

765 (71.1)

252 (71.4)

 

 Overweight (≥23.0)

317 (18.1)

70 (19.1)

169 (16.7)

78 (21.2)

 

Alcohol consumption (glasses/week)

     

 ≤2.5

1,217 (66.3)

291 (72.5)

708 (65.5)

218 (62.1)

0.035

 >2.5

592 (33.7)

109 (27.5)

346 (34.5)

137 (37.9)

 

Smoking status

     

 Non-smoker

1,532 (82.3)

343 (86.1)

904 (82.4)

285 (78.3)

0.040

 Ex-smoker

136 (8.5)

30 (8.0)

76 (8.8)

30 (8.0)

 

 Current smoker

141 (9.2)

27 (5.8)

74 (8.8)

40 (13.7)

 

Sleep duration (hours/day)

     

 ≤5

151 (9.0)

30 (8.7)

85 (9.0)

36 (9.4)

0.028

 6–8

1,527 (83.5)

327 (79.4)

897 (83.9)

303 (86.5)

 

 ≥9

131 (7.5)

43 (11.9)

72 (7.2)

16 (4.1)

 

Regular walking

     

 Yes

658 (37.3)

152 (40.6)

388 (37.9)

118 (32.5)

0.135

 No

1,150 (62.7)

248 (59.4)

665 (62.1)

237 (67.5)

 

Coffee intake (cups/day)

     

 <1

504 (37.8)

87 (31.2)

304 (39.2)

113 (40.2)

0.130

 ≥1

840 (62.2)

200 (68.8)

479 (60.8)

161 (59.8)

 

Working type

     

 Day work

1,478 (81.6)

281 (67.1)

907 (85.6)

290 (85.0)

<0.001

 Non-day work

317 (18.4)

117 (32.9)

141 (14.4)

59 (15.0)

 

Occupation

     

 Manual work

266 (15.6)

61 (16.4)

145 (14.8)

60 (17.1)

0.633

 Non-manual work

1,542 (84.4)

339 (83.6)

909 (85.2)

294 (82.9)

 

Employment status

     

 Salary worker

1,127 (73.8)

206 (64.7)

746 (81.9)

175 (60.8)

<0.001

 Self-employed

289 (19.1)

87 (26.1)

108 (13.1)

94 (28.3)

 

 Unpaid family worker

107 (7.2)

26 (9.2)

42 (5.0)

39 (10.9)

 
  1. *Estimate percentage.
  2. χ2 test.