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Table 1 General characteristics of the study subjects

From: The relationship between night work and involuntary weight change: data from the fifth Korea National Health and Nutrition Examination Survey (KNHANES 2010–2012)

 

Total

Male

Female

Variable

na

nb(%c)

na

nb(%c)

na

nb(%c)

Total

1605

4077302(100.0)

1075

2960342(100.0)

530

1116959(100.0)

Age(years)

 20–29

216

821331(20.1)

116

529449(17.9)

100

291882(26.1)

 30–39

474

1230449(30.2)

343

980278(33.1)

131

250171(22.4)

 40–49

401

1068241(26.2)

285

794654(26.8)

116

273587(24.5)

 50–59

315

654930(16.1)

205

458585(15.5)

110

196345(17.6)

 60–69

199

302351(7.4)

126

197377(6.7)

73

104974(9.4)

Education

  ≤ Middle school

347

782262(19.2)

192

493489(16.7)

155

288773(25.9)

 High school

540

1500737(36.8)

366

1120342(37.8)

174

380394(34.1)

  ≥ University

718

1794303(44.0)

517

1346511(45.5)

201

447792(40.1)

Income

 1st quartile

137

328103(8.0)

74

196406(6.6)

63

131697(11.8)

 2nd quartile

443

1204464(29.5)

313

927339(31.3)

130

277125(24.8)

 3rd quartile

552

1445150(35.4)

371

1043236(35.2)

181

401914(36.0)

 4th quartile

473

1099584(27.0)

317

793362(26.8)

156

306223(27.4)

Marital status

 Single

262

934340(22.9)

154

630167(21.3)

108

304173(27.2)

 Married

1252

2931100(71.9)

893

2243410(75.8)

359

687690(61.6)

 Others

91

211862(5.2)

28

86766(2.9)

63

125096(11.2)

Alcohol drinking

 None or social

1159

2837667(69.6)

674

1832693(61.9)

485

1004975(90.0)

 Moderate or heavy

446

1239634(30.4)

401

1127650(38.1)

45

111985(10.0)

Smoking

 None or ex-smoker

999

2322062(57.0)

503

1289687(43.6)

496

1032375(92.4)

 Current smoker

606

1755240(43.0)

572

1670656(56.4)

34

84585(7.6)

Physical activity

 Light

1383

3462054(84.9)

918

2484421(83.9)

465

977633(87.5)

 Moderate

91

242915(6.0)

52

155782(5.3)

39

87133(7.8)

 Vigorous

131

372332(9.1)

105

320139(10.8)

26

52193(4.7)

Type of job

 Non-manual

713

1771262(43.4)

479

1257519(42.5)

234

513743(46.0)

 Manual

892

2306040(56.6)

596

1702823(57.5)

296

603217(54.0)

Working hours per week

  ≤ 48

957

2380084(58.4)

570

1588447(53.7)

387

791637(70.9)

  > 48

648

1697218(41.6)

505

1371896(46.3)

143

325322(29.1)

Work schedule

 Day work

1418

3643616(89.4)

923

2609320(88.1)

495

1034295(92.6)

 Night work

187

433686(10.6)

152

351022(11.9)

35

82664(7.4)

 Night shift

28

74393(17.2)

18

48319(13.8)

10

26074(31.5)

 Regular shift

78

201489(46.5)

62

164707(46.9)

16

36781(44.5)

 24 hour shift

51

92821(21.4)

46

84865(24.2)

5

7956(9.6)

 Irregular shift

30

64983(15.0)

26

53130(15.1)

4

11853(14.3)

Weight change

 No weight change

1248

3042783(74.6)

847

2219990(75.0)

401

822794(73.7)

 Weight loss

142

381040(9.3)

92

278769(9.4)

50

102270(9.2)

 Weight gain

215

653478(16.0)

136

461583(15.6)

79

191895(17.2)

  1. aunweighted count
  2. bestimated population size
  3. ccolumn and estimated percentage