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Table 1 Baseline characteristics of participants by depression status in KNHANES 2007−2012

From: Active smoking and exposure to secondhand smoke and their relationship to depressive symptoms in the Korea national health and nutrition examination survey (KNHANES)

(N=, weighted N=)
  Men (N = 14,886, weighted N = 18,449,986)   Women (N = 20,241, weighted N = 18,929,457)  
  depression (−) (N = 13,418) (Weighted N = 16,715,177) depression (+) (N = 1,468) (Weighted N = 1,734,808) P-value depression (−) (N = 16,583) (Weighted N = 15,575,753) depression (+) (N = 3,658) (Weighted N = 3,353,704) P-value
General factors Weighted % Weighted %   Weighted % Weighted %  
Smoking status    0.015    <0.001
 Current smoker       
 Exposed to SHS 34.9 37.8   4.9 9.1  
 Not Exposed to SHS 26.6 29.8   4.2 6.4  
 Former smoker       
 Exposed to SHS 8.4 7.6   1.3 2.1  
 Not Exposed to SHS 10.0 8.7   2 2.3  
 Never smoker       
 Exposed to SHS 9.6 8.0   31.5 31.5  
 Not Exposed to SHS 10.6 8.1   56.1 48.6  
Age    <0.001    <0.001
 19−39 43.7 36.2   41.0 33.0  
 40−59 39.8 43.3   38.5 39.2  
 ≥60 16.6 20.5   20.5 27.8  
Marital status    <0.001    <0.001
 Never married 25.7 25.5   17.5 15.0  
 Married-living with partner 70.3 64.4   67.7 61.0  
 Married-others 4.0 10.1   14.8 24.0  
Education attainment    <0.001    <0.001
 <6 years 12.0 19.7   24.1 35.4  
 6−8 years 10.0 13.4   9.8 11.7  
 9−11 years 42.2 41.2   37.7 33.5  
 ≥12 years 35.9 25.7   28.5 19.4  
Employment status    <0.001    0.002
 Wage working 49.4 38.3   32.4 28.7  
 Self-supporting 26.9 29.1   11.1 10.8  
 House-employed 1.6 2.5   5.9 5.8  
 No financial activity 22.0 30.0   20.6 54.6  
Number of family members    <0.001    <0.001
 Living alone 4.9 7.7   6.2 9.3  
 Living with one family member 19.4 20.5   19.2 22.9  
 Living with two family members 26.8 26.8   24.6 25.9  
 Living with ≥3 family members 48.8 45.0   49.9 41.9  
Body mass index (kg/m2)    0.5    0.018
 <18.5 3.0 3.5   6.7 6.5  
 18.5−22.9 34.9 36.1   45.1 42.7  
 23−24.9 25.6 26.1   20.8 20.8  
 25−29.9 32.2 31.1   23.2 24.5  
 ≥30 4.2 3.2   4.2 5.5  
Alcohol dependence by AUDIT score    <0.001    <0.001
 0−7 (Normal) 44.2 39.6   84.1 76.1  
 8−15 (Mild dependence) 34.2 26.7   12.6 15.6  
 16−19 (Moderate dependence) 11.2 12.9   1.6 3.8  
 20−40 (Severe dependence) 10.5 20.8   1.7 4.5  
Self-reported stress    <0.001    <0.001
 Very high 2.7 16.4   3.0 17.5  
 High 19.5 42.0   21.5 44.7  
 Moderate 61.7 37.5   60.4 32.7  
 Little 16.0 4.2   15.1 5.0  
Self-reported health status    <0.001    <0.001
 Very good 5.9 3.8   4.0 2.4  
 Good 37.3 21.5   31.8 19.3  
 Normal 43.8 41.4   44.8 38.6  
 Bad 11.7 27.2   16.7 30.4  
 Very bad 1.3 6.1   2.7 9.3  
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