Cognitive decline and the evolution of depression networks in older adults: evidence from the CHARLS study.

Although all time points demonstrated highly significant statistical differences between classes ( p < 0.001), the gap between Class 1 and Class 2 narrowed over time, with their difference decreasing from 1.25 points at T1 to 0.43 points by T4, while Class 3 remained distinctly lower throughout all time points (Fig. 3 ).

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