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Kaplan–Meier survival curves for all-cause dementia (left), Alzheimer’s disease (middle), and vascular dementia (right) in groups stratified by median split of baseline Lubben Social Network Scale (LSNS) scores. LSNS scores > 29 are indicated by the solid red line, and LSNS scores ≤ 29 by the dashed brown line. p Values were determined by log-rank tests.
