Six- and 15-month post-baseline data were collected via phone by telephone surveyors who were blind to the study group assignment. At 6-months, 414 women participated in the telephone survey in Korean, with 3.3% lost to follow-up. At 15-months post-baseline, 395 women participated in the telephone survey, with 7.7% lost to follow-up, for the entire study period. The reasons for lost to follow-up were death, refused to participate, or unable to contract. KA women included at the 15 months' data collection (n = 395) and those who dropped out (n = 33) did not differ in demographic or other major variables in this study.