Measures
The demographic and socioeconomic measures included age, gender, marital status, education and income. The health measures of health status included questions on whether the subject considered his or her health to be very good, good, fair, poor or very poor, and whether a chronic condition had been a problem during the last 24 months. Health services utilization included physician visits and the use of traditional Korean medicine. For physician visits, the actual volume of use (number of visits) during the previous 24 months was gathered. For the use of traditional Korean medicine, the respondents were asked whether they had visited traditional Korean medical practitioners during the 24 months preceding the interview.