Figure 1.

Overview of sample selection, participation, and attrition for SEBAS, 2000 and 2006. TLSA, Taiwan Longitudinal Survey of Aging (also known as the Survey of Health and Living Status of the Near–Elderly and Elderly in Taiwan); SEBAS, Social Environment and Biomarkers of Aging Study; LFU, lost-to-follow-up^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 draw). Source: SEBAS User’s Guide².