Table 1. Subject characteristics.

Values are presented as mean±standard error for continuous variables or percentage±standard error for categorical variables.

^*1 USD=1,000 Korean won. ^†Vigorous-intensity activity ≥3 days/wk, moderate-intensity activity including walking ≥5 days/wk. ^‡Office workers (general managers, government administrators, professionals, and simple office worker), manual workers (clerk, service and sales workers, skilled agricultural, forestry, and fishery workers, persons who operate or assemble craft, equipment, or machines, and elementary workers), others (unemployed persons, housekeepers, and students). ^§Married and not separated (individuals who had married and lived with their spouse, single (individuals who were not married, those who were married but separated, widows/widowers, and divorcees), and non-responders.