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The number of participants in the CNSSD was 2,526,145. According to the Law of the People’s Republic of China on the Protection of the Rights and Interests of Older Adults, older adults referred to those over 60 years old; thus, we restricted our analysis to 354,895 adults. After excluding the extreme income values (equals 0 or 99,999, n = 116), we obtained a final study sample size of 354,743. The flowchart of the sample screening can be found in Figure 1.

Flowchart of the study sample.

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