Associations between indirect smoking exposure time and knee osteoarthritis (OA)* in Korean adults aged 50 years or over in Korean National Health and Nutrition Examination Survey (KNHANES) 2010–2012
| Adjusted for age and sex | Fully adjusted† | Selectively adjusted‡ | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Factors | n (case) | OR | 95% CI | p Value | OR | 95% CI | p Value | OR | 95% CI | p Value |
| Indirect smoking exposure time | ||||||||||
| All | ||||||||||
| None | 981 (808) | 1 | 1 | 1 | ||||||
| Less than 1 h of indirect smoking exposure time at home or at work | 180 (135) | 0.851 | 0.527 to 1.376 | 0.5104 | 0.852 | 0.492 to 1.476 | 0.5675 | 0.897 | 0.554 to 1.454 | 0.6601 |
| 1 h or more indirect smoking exposure time at home or at work | 63 (49) | 1.029 | 0.407 to 2.601 | 0.9520 | 1.279 | 0.452 to 3.622 | 0.6430 | 1.124 | 0.424 to 2.982 | 0.8143 |
Multinomial logistic regression analysis.
*Patients who met knee OA criteria with indirect smoking exposure.
†Adjusted for age, sex, household income, education, occupation, residential area, alcohol drinking, dietary habits, exercise habits, experience of depressive symptoms, body mass index and fasting blood glucose.
‡Backward elimination method was used with significance set at p<0.05.