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Table 1 General characteristics of the study population

From: Association between night work and dyslipidemia in South Korean men and women: a cross-sectional study

Variables Dyslipidemia
Male   Female
TOTAL Yes No P-value TOTAL Yes No P-value
N % N % N % N % N % N %
Work pattern        0.004        0.252
 Day 2404 85.2 684 28.5 1720 71.5   2512 84.0 382 15.2 2130 84.8  
 Night 196 6.9 76 38.8 120 61.2   379 12.7 70 18.5 309 81.5  
 Other shifts 221 7.8 56 25.3 165 74.7   101 3.4 17 16.8 84 83.2  
Age(years)        0.011        <.0001
 30~39 741 26.3 210 28.3 531 71.7   830 27.7 85 10.2 745 89.8  
 40~49 738 26.2 236 32.0 502 68.0   997 33.3 119 11.9 878 88.1  
 50~59 634 22.5 196 30.9 438 69.1   742 24.8 163 22.0 579 78.0  
  ≥ 60 708 25.1 174 24.6 534 75.4   423 14.1 102 24.1 321 75.9  
Region        0.586        0.314
 Metropolitan 1696 60.1 497 29.3 1199 70.7   1861 62.2 282 15.2 1579 84.8  
 Rural 1125 39.9 319 28.4 806 71.6   1131 37.8 187 16.5 944 83.5  
Educational level        0.348        <.0001
  ≤ Highschool 1541 54.6 457 29.7 1084 70.3   1812 60.6 343 18.9 1469 81.1  
  ≥ College 1280 45.4 359 28.0 921 72.0   1180 39.4 126 10.7 1054 89.3  
Occupational categoriesª        0.156        <.0001
 White 1085 38.5 336 31.0 749 69.0   1275 42.6 144 11.3 1131 88.7  
 Pink 355 12.6 101 28.5 254 71.5   859 28.7 157 18.3 702 81.7  
 Blue 1381 49.0 379 27.4 1002 72.6   858 28.7 168 19.6 690 80.4  
Household income        0.179        <.0001
 Low 272 9.6 79 29.0 193 71.0   295 9.9 75 25.4 220 74.6  
 Mid-low 679 24.1 184 27.1 495 72.9   701 23.4 115 16.4 586 83.6  
 Mid-high 910 32.3 251 27.6 659 72.4   908 30.3 121 13.3 787 86.7  
 High 960 34.0 302 31.5 658 68.5   1088 36.4 158 14.5 930 85.5  
Marital status        0.898        0.087
 Living w/ spouse 2465 87.4 712 28.9 1753 71.1   2384 79.7 360 15.1 2024 84.9  
 Living w/o spouse 356 12.6 104 29.2 252 70.8   608 20.3 109 17.9 499 82.1  
Eating habit(daily)        0.014        0.564
 Regularly eat breakfast, lunch, and dinner 1772 62.8 484 27.3 1288 72.7   1625 54.3 249 15.3 1376 84.7  
 Skip meal(s) 1049 37.2 332 31.6 717 68.4   1367 45.7 220 16.1 1147 83.9  
Physical activity        0.356        0.145
 Active 1549 54.9 437 28.2 1112 71.8   1528 51.1 254 16.6 1274 83.4  
 Inactive 1272 45.1 379 29.8 893 70.2   1464 48.9 215 14.7 1249 85.3  
Sleep duration(hours)        0.077        0.833
 0~6 1460 51.8 401 27.5 1059 72.5   1570 52.5 244 15.5 1326 84.5  
  ≥ 7 1361 48.2 415 30.5 946 69.5   1422 47.5 225 15.8 1197 84.2  
Smoking status        <.0001        0.346
 Current smoker 1046 37.1 352 33.7 694 66.3   135 4.5 17 12.6 118 87.4  
 Ex-smoker 1149 40.7 310 27.0 839 73.0   131 4.4 25 19.1 106 80.9  
 Non-smoker 626 22.2 154 24.6 472 75.4   2726 91.1 427 15.7 2299 84.3  
Drinking status        0.097        0.001
  ≥ 2 times / month 2063 73.1 579 28.1 1484 71.9   1420 47.5 189 13.3 1231 86.7  
 Never 758 26.9 237 31.3 521 68.7   1572 52.5 280 17.8 1292 82.2  
BMIb        <.0001        <  0.0001
 Obese(≥25) 809 28.7 257 31.8 552 68.2   564 18.9 129 22.9 435 77.1  
 Overweight(23~24.9) 855 30.3 291 34.0 564 66.0   667 22.3 138 20.7 529 79.3  
 Normal+underweight(< 23) 1157 41.0 268 23.2 889 76.8   1761 58.9 202 11.5 1559 88.5  
Hypertension        0.102        <  0.0001
 Hypertension 627 22.2 160 25.5 467 74.5   375 12.5 82 21.9 293 78.1  
 Pre-hypertension 897 31.8 269 30.0 628 70.0   601 20.1 111 18.5 490 81.5  
 Normal 1297 46.0 387 29.8 910 70.2   2016 67.4 276 13.7 1740 86.3  
Diabetes        0.006        0.102
 Diabetes mellitus 176 6.2 49 27.8 127 72.2   78 2.6 19 24.4 59 75.6  
 Impaired fasting glucose 641 22.7 154 24.0 487 76.0   400 13.4 62 15.5 338 84.5  
 Normal 2004 71.0 613 30.6 1391 69.4   2514 84.0 388 15.4 2126 84.6  
Menopause               <  0.0001
 Yes         834 27.9 193 23.1 641 76.9  
 No         2158 72.1 276 12.8 1882 87.2  
Year        0.604        0.014
 2013 747 26.5 216 28.9 531 71.1   764 25.5 119 15.6 645 84.4  
 2014 704 25.0 200 28.4 504 71.6   722 24.1 90 12.5 632 87.5  
 2015 668 23.7 206 30.8 462 69.2   689 23.0 129 18.7 560 81.3  
 2016 702 24.9 194 27.6 508 72.4   817 27.3 131 16.0 686 84.0  
Calorie intake(Kcal)c 2468.3 ±1007.7 2466.7 ±1106.9 2468.9 ±964.3 0.958 1806.7 ±712.2 1803.5 ±753.0 1807.3 ±704.2 0.914
Protein intake(g)c 86.3 ±60.3 88.3 ±87.4 85.5 ±44.8 0.259 62.8 ±31.8 62.0 ±30.8 62.9 ±32.0 0.567
Fat intake(g)c 53.1 ±40.6 52.8 ±46.5 53.2 ±37.9 0.788 40.4 ±28.6 37.2 ±28.1 40.9 ±28.7 0.010
Carbohydrate intake(g)c 361.9 ±132.9 358.9 ±128.3 363.2 ±134.8 0.439 286.8 ±115.9 294.0 ±128.4 285.4 ±113.4 0.141
Total 2821 100.0 816 28.9 2005 71.1   2992 100.0 469 15.7 2523 84.3  
  1. BMI body mass index
  2. aThree groups based on International Standard Classification Occupations codes
  3. bObesity status defined by BMI based on 2014 Clinical Practice Guidelines for Overweight and Obesity in Korea
  4. cMean and Standard deviation (SD) of the continuous independent variables in this study