FIG. 1.

Attrition among sample selected for Social Environment and Biomarkers of Aging Study (SEBAS), 2000–2006. ^aA few respondents living in remote areas were excluded from the subsample because they lived too far from the hospitals contracted to do the physical examination portion of the study. ^bSome respondents were not asked to participate in the hospital examination due to their health condition (i.e., living in an institution, seriously ill, catheter or diaper, kidney dialysis, other health condition that precludes blood drawing). TLSA, Taiwan Longitudinal Study on Aging (sometimes referred to as the Survey of Health and Living Status of the Near Elderly and Elderly in Taiwan); LFU, lost to follow-up.