Data are shown as n (%) or the mean ± standard deviation. P values were calculated by chi-square test or Student’s t-test
“Current drinker” was defined as alcohol consumption at least once a month; “Not drinking” was defined as alcohol consumption less than once a month.
Average monthly household income (unit: 10,000 KRW)
“Office” includes administrative, professional, and clerical work; “Service” includes service and sales industries; “Others” includes skilled or machine work, labour, agriculture and forestry, fishing, and unemployment.