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Fig. 1 | BMC Public Health

Fig. 1

From: Changes in perceived uselessness and risks for mortality: evidence from a National sample of older adults in China

Fig. 1

Construction of study sample by wave. Respondents who had at least two interviews were included in the calculation of changes in self-perceived uselessness (indicated with bold font). Respondents who had at least one episode of mortality risk were included in the study (indicated with shadowed font). Respondents who had three episodes of change in self-perceived uselessness and two episodes of mortality risk are indicated with italic font in the shadowed boxes. The total number of individuals included in the study is 10,051 (= 4152 + 2164 + 2434 + 1301) who contributed 13,976 observations (= 10,051 + 2792 + 1133)

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