Association between frailty trajectories and stroke incidence among Chinese older adults: evidence from CHARLS 2011-2015.

Cluster 1 (represented in red) showed a relatively stable or slightly declining trajectory with lower frailty index values, while Cluster 2 (represented in blue) exhibited an increasing trend with consistently higher frailty index values ( Figure 1c ).

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In contrast, among those aged ≥80 years, the associations were attenuated and did not reach statistical significance, possibly due to survival effects or smaller sample size in this age group.

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