부산대학교 도서관

Objective: Losing participants' self-report data affects process and outcome analyses, and ultimately, conclusions about results. In this paper, we examine predictors of loss to self-report data collection and attempt to identify potential predictors that can be addressed prospectively. Methods: Data were from a study to increase colorectal and breast cancer screening in women 50-75 years of age (N = 1196). We collected self-report data at baseline (T1), 4 weeks (T2), and 6 months (T3) after consent. Analyses identified predictors of earliest loss (T1 vs T1, T2, T3), intermediate loss (T1 vs T1, T2), and later loss (T1, T2 vs T1, T2, T3). Results: Cancer knowledge and self-reported screening barriers were associated with loss to follow-up. More health problems were associated with less intermediate loss to follow-up, but higher loss to later follow-up. Two intervention groups (Web Only, and Web + Phone) showed greater loss compared to Usual Care. Being overdue for both screenings predicted early loss. Completing the T1 survey by phone was associated with greater loss to follow-up. Conclusions: Knowledge and barriers may have had an early effect, whereas health problems might have had a delayed impact. Intervention characteristics also need to be considered as a source of task demands on participants. [ABSTRACT FROM AUTHOR]