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KX Ke Ying Xu
JW Jun Jie Wang
JC Jing Chen
XZ Xinxiu Zhao
LY Ling Fang Yuan
QZ Qin Zhang
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The CLHLS study is utilized to investigate health conditions through face-to-face interviews in the Chinese communities. The CLHLS study was established in 1998 and is conducted every 3 years in seven waves. It includes many cities in 23 out of 31 provinces and covers more than 85% of China’s population. For the present research, we have used the data obtained from the seventh wave of the CLHLS conducted in 2014. This survey included 7192 old adults; 2546 of them had blood samples collected for laboratory studies. In our study, the exclusion criteria were (1) Age < 60 years (n = 28); (2) Missing frailty index data (n = 973), laboratory measurement data (n = 93), anthropometric measurements (n = 174), and demographic data (n = 62). Finally, we retained 1216 participants who were aged ≥60 years and for whom complete data were available (Fig. 1).

Flowchart of the study identification process

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