Results of multiple logistic regression analysis showing the influence of participant smoking status in their early 60(60–64 years) on cognitive impairment after a 5-year follow-up.

OR, odds ratio; CI, cognitive impairment.aAdjusted for gender, marital status, number of cohabitants, employment status, education, hospitalization during the past one year, depressive symptoms, impairment in instrumental activities of daily living, Korean version of the Mini-Mental State Examination score, and drinking status at baseline.bAdjusted for marital status, number of cohabitants, employment status, education, hospitalization during the past one year, depressive symptom, impairment in instrumental activities of daily living, Korean version of the Mini-Mental State Examination score, and drinking status at baseline.