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Table 4 Involuntary weight change according to characteristics in female 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)

  No weight change Weight loss Weight gain
Variable na(%b) na(%b) na(%b)
Total 822794(100.0) 102270(100.0) 191895(100.0)
Age(years)c,d
 20–29 216836(26.4) 25752(25.2) 49294(25.7)
 30–39 148273(18.0) 39560(38.7) 62338(32.5)
 40–49 191374(23.3) 18203(17.8) 64009(33.4)
 50–59 174512(21.2) 10948(10.7) 10886(5.7)
 60–69 91799(11.2) 7807(7.6) 5368(2.8)
Educationd
  ≤ Middle school 245145(29.8) 23029(22.5) 20599(10.7)
 High school 241590(29.4) 31565(30.9) 107239(55.9)
  ≥ University 336059(40.8) 47676(46.6) 64057(33.4)
Income
 1st quartile 96039(11.7) 13273(13.0) 22386(11.7)
 2nd quartile 202988(24.7) 30086(29.4) 44051(23.0)
 3rd quartile 299364(36.4) 32570(31.8) 69980(36.5)
 4th quartile 224403(27.3) 26341(25.8) 55478(28.9)
Marital status
 Single 235649(28.6) 19664(19.2) 48860(25.5)
 Married 489691(59.5) 69149(67.6) 128851(67.1)
 Others 97454(11.8) 13458(13.2) 14184(7.4)
Alcohol drinkingd
 None or social 766987(93.2) 93006(90.9) 144982(75.6)
 Moderate or heavy 55807(6.8) 9264(9.1) 46913(24.4)
Smokingd
 None or ex-smoker 775650(94.3) 94836(92.7) 161889(84.4)
 Current smoker 47144(5.7) 7435(7.3) 30006(15.6)
Physical activity
 Light 714667(86.9) 81249(79.4) 181717(94.7)
 Moderate 65375(7.9) 16373(16.0) 5385(2.8)
 Vigorous 42752(5.2) 4649(4.5) 4793(2.5)
Type of job
 Non-manual 384975(46.8) 44607(43.6) 84161(43.9)
 Manual 437819(53.2) 57663(56.4) 107734(56.1)
Working hours per week
  ≤ 48 588048(71.5) 68562(67.0) 135026(70.4)
  > 48 234745(28.5) 33708(33.0) 56869(29.6)
Work schedule
 Day work 764035(92.9) 96299(94.2) 173961(90.7)
 Night work 58759(7.1) 5971(5.8) 17934(9.3)
  1. aestimated population size
  2. bcolumn and estimated percentage
  3. csignificantly different between no weight change and weight loss subjects (p < 0.05)
  4. dsignificantly different between no weight change and weight gain subjects (p < 0.05)