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Table 1 Characteristics of Korean adults aged ≥19 years participating in KNHANES V (2010–2012) (N = 17,638)

From: The association between mental health, chronic disease and sleep duration in Koreans: a cross-sectional study

  Sleep duration  
Variable ≤6 h 7–8 h ≥9 h p-valueb
  n = 7,384 n = 8,936 n = 1,318  
Age (mean ± SD)a 47.9 ± 16.0 44.1 ± 15.0 44.7 ± 18.2 <.001
Sex    
 Male 3110 (41.6) 3861 (51.6) 511 (6.8) 0.001
 Female 4274 (42.1) 5075 (50.0) 807 (8.0)  
Household income    
 Low 1789 (42.2) 2054 (48.4) 397 (9.4) <.001
 Middle-low 1781 (40.3) 2270 (51.4) 364 (8.2)  
 Mid-upper 1841 (41.6) 2282 (51.6) 301 (6.8)  
 High 1889 (43.2) 2242 (51.3) 242 (5.5)  
Education    
 ≤8 years 2316 (50.6) 1816 (39.6) 449 (9.8) <.001
 9–11 years 833 (43.1) 953 (49.3) 148 (7.7)  
 12–15 years 2209 (38.5) 3119 (54.3) 413 (7.2)  
 ≥16 years 2006 (37.6) 3028 (56.7) 304 (5.7)  
Employment    
 Unemployed 3011 (41.9) 3499 (48.7) 680 (9.5) <.001
 Employed 4355 (41.9) 5418 (52.1) 634 (6.1)  
Marital status    
 With spouse 5330 (40.6) 6863 (52.2) 949 (7.2) <.001
 Separated, divorced, bereaved 1227 (55.5) 833 (37.6) 153 (6.9)  
 Single 541 (36.5) 800 (53.9) 142 (9.6)  
Body mass index    
 <18.5 273 (34.7) 422 (53.7) 91 (11.6) <.001
 <23 2788 (39.6) 3681 (52.3) 567 (8.1)  
 <25 1780 (43.3) 2064 (50.2) 269 (6.5)  
 ≥25 2511 (44.7) 2723 (48.5) 381 (6.8)  
Smoking status    
 Never smokers 4520 (41.7) 5502 (50.8) 806 (7.4) 0.63
 Exsmokers 1370 (42.5) 1610 (50.0) 242 (7.5)  
 Current smokers 1491 (41.6) 1823 (50.9) 270 (7.5)  
Drinking    
 Non alcohol consumption 2306 (45.5) 2339 (46.1) 424 (8.4) <.001
 <1 drinking episode per month 1369 (40.7) 1755 (52.2) 240 (7.1)  
 <5 drinking episodes per month 2115 (38.7) 2964 (54.2) 386 (7.1)  
 ≥5 drinking episodes per month 1571 (42.9) 1824 (49.9) 264 (7.2)  
Level of daily activity    
 Sedentary 789 (40.8) 872 (45.1) 272 (14.1) <.001
 Light 2924 (40.4) 3831 (52.9) 483 (6.7)  
 Moderate 3032 (43.3) 3551 (50.7) 426 (6.1)  
 Heavy/extreme 633 (43.9) 675 (46.8) 134 (9.3)  
Subjective health    
 Good 2319 (40.0) 3113 (53.6) 372 (6.4) <.001
 Fair 3409 (40.9) 4328 (51.9) 599 (7.2)  
 Bad 1641 (47.4) 1477 (42.7) 344 (9.9)  
Bed rest for the past month    
 No 6684 (41.4) 8284 (51.3) 1166 (7.2) <.001
 Yes 684 (46.7) 633 (43.2) 148 (10.1)  
Absence from work for the past month    
 No 4211 (41.0) 5427 (52.9) 631 (6.1) <.001
 Yes 277 (47.5) 256 (43.9) 50 (8.6)  
  1. aThere are no missing values for age
  2. b P-value calculated from ANOVA or Rao-Scott chi-square test for continuous and categorical variables