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Table 3 Involuntary weight change according to characteristics in male 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 2219990(100.0) 278769(100.0) 461583(100.0)
Age(years)c,d
 20–29 309365(13.9) 61956(22.2) 158128(34.3)
 30–39 638936(28.8) 129157(46.3) 212184(46.0)
 40–49 687560(31.0) 48748(17.5) 58346(12.6)
 50–59 416913(18.8) 15891(5.7) 25780(5.6)
 60–69 167216(7.5) 23016(8.3) 7145(1.5)
Educationd
  ≤ Middle school 415384(18.7) 41724(15.0) 36381(7.9)
 High school 809988(36.5) 121416(43.6) 188938(40.9)
  ≥ University 994617(44.8) 115629(41.5) 236265(51.2)
Income
 1st quartile 128890(5.8) 37409(13.4) 30107(6.5)
 2nd quartile 690811(31.1) 81863(29.4) 154665(33.5)
 3rd quartile 784316(35.3) 109728(39.4) 149192(32.3)
 4th quartile 615973(27.7) 49770(17.9) 127619(27.6)
Marital status d
 Single 406539(18.3) 80784(29.0) 142844(30.9)
 Married 1749396(78.8) 188786(67.7) 305228(66.1)
 Others 64055(2.9) 9199(3.3) 13512(2.9)
Alcohol drinkingd
 None or social 1410436(63.5) 177538(63.7) 244719(53.0)
 Moderate or heavy 809553(36.5) 101232(36.3) 216864(47.0)
Smoking
 None or ex-smoker 1022453(46.1) 96115(34.5) 171118(37.1)
 Current smoker 1197536(53.9) 182654(65.5) 290465(62.9)
Physical activity
 Light 1848629(83.3) 219257(78.7) 416536(90.2)
 Moderate 123131(5.5) 21311(7.6) 11341(2.5)
 Vigorous 248230(11.2) 38202(13.7) 33707(7.3)
Type of jobc
 Non-manual 965184(43.5) 74162(26.6) 218173(47.3)
 Manual 1254805(56.5) 204607(73.4) 243411(52.7)
Working hours per week
  ≤ 48 1183501(53.3) 119901(43.0) 285045(61.8)
  > 48 1036489(46.7) 158868(57.0) 176538(38.2)
Work schedule
 Day work 1938500(87.3) 259215(93.0) 411605(89.2)
 Night work 281489(12.7) 19554(7.0) 49978(10.8)
  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)