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Table 3 Association between secondhand smoking and depression with different exposure duration

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

Characteristics Male Female
Case N (weighted %) ORa (95 % CI) Case N (weighted %) ORa (95 % CI)
Workplace exposure (N = men 14,766, women 19,804)   
 No exposure 859 (54.8) 1.00 (ref) 2,879 (77.2) 1.00 (ref)
 <1 hour/day 389 (29.4) 0.92 (0.77–1.09) 470 (14.0) 0.89 (0.76–1.04)
 ≥1 hour/day 208 (15.8) 1.23 (0.97–1.54) 246 (8.8) 1.32 (1.06–1.64)
  p-trend 0.256 p-trend 0.159
Home exposure (N = men 14,846, women 20,194)   
 No exposure 1,359 (91.5) 1.00 (ref) 2,896 (75.4) 1.00 (ref)
 <1 hour/day 81 (6.6) 0.90 (0.65–1.23) 2,083 (17.1) 1.18 (1.02–1.35)
 ≥1 hour/day 24 (2.0) 1.21 (0.69–2.13) 215 (7.5) 1.71 (1.34–2.18)
  p-trend 0.977 p-trend <0.001
  1. aAdjusted for age, marital status, education, employment status, self-reported stress, self-rated health, alcohol dependence (AUDIT) and past diagnosis of depression by physicians
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