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Table 2 General characteristics of male and female by work schedule

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

  Male Female
Variable Day work Night work Day work Night work
  na(%b) na(%b) na(%b) na(%b)
Total 2609320(100.0) 351022(100.0) 1034295(100.0) 82664(100.0)
Age(years)c
 20–29 468087(17.9) 61363(17.5) 261607(25.3) 30275(36.6)
 30–39 875124(33.5) 105154(30.0) 232659(22.5) 17512(21.2)
 40–49 738135(28.3) 56519(16.1) 253412(24.5) 20175(24.4)
 50–59 404736(15.5) 53848(15.3) 185802(18.0) 10543(12.8)
 60–69 123239(4.7) 74138(21.1) 100814(9.7) 4160(5.0)
Educationc
  ≤ Middle school 422070(16.2) 71419(20.3) 277763(26.9) 11010(13.3)
 High school 945666(36.2) 174676(49.8) 342680(33.1) 37714(45.6)
  ≥ University 1241584(47.6) 104927(29.9) 413852(40.0) 33940(41.1)
Income
 1st quartile 178888(6.9) 17518(5.0) 128559(12.4) 3138(3.8)
 2nd quartile 835447(32.0) 91892(26.2) 253419(24.5) 23706(28.7)
 3rd quartile 902113(34.6) 141123(40.2) 370488(35.8) 31426(38.0)
 4th quartile 692873(26.6) 100489(28.6) 281829(27.2) 24394(29.5)
Marital status
 Single 538421(20.6) 91746(26.1) 274416(26.5) 29757(36.0)
 Married 1988519(76.2) 254890(72.6) 645458(62.4) 42232(51.1)
 Others 82380(3.2) 4386(1.2) 114422(11.1) 10674(12.9)
Alcohol drinkingd
 None or social 1592309(61.0) 240384(68.5) 944300(91.3) 60675(73.4)
 Moderate or heavy 1017012(39.0) 110638(31.5) 89995(8.7) 21989(26.6)
Smoking
 None or ex-smoker 1111880(42.6) 177806(50.7) 964964(93.3) 67411(81.5)
 Current smoker 1497440(57.4) 173216(49.3) 69331(6.7) 15253(18.5)
Physical activity
 Light 2174814(83.3) 309607(88.2) 910681(88.0) 66952(81.0)
 Moderate 147376(5.6) 8406(2.4) 82729(8.0) 4405(5.3)
 Vigorous 287130(11.0) 33010(9.4) 40886(4.0) 11307(13.7)
Type of jobc
 Non-manual 1212165(46.5) 45354(12.9) 487665(47.1) 26078(31.5)
 Manual 1397155(53.5) 305668(87.1) 546630(52.9) 56586(68.5)
Working hours per weekc
  ≤ 48 1471445(56.4) 117002(33.3) 734250(71.0) 57386(69.4)
  > 48 1137876(43.6) 234020(66.7) 300045(29.0) 25278(30.6)
Weight change
 No weight change 1938500(74.3) 281489(80.2) 764035(73.9) 58759(71.1)
 Weight loss 259215(9.9) 19554(5.6) 96299(9.3) 5971(7.2)
 Weight gain 411605(15.8) 49978(14.2) 173961(16.8) 17934(21.7)
  1. aestimated population size
  2. bcolumn and estimated percentage
  3. csignificantly different between day work and night work in male subjects (p < 0.05)
  4. dsignificantly different between day work and night work in female subjects (p < 0.05)