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Mean age of subjects with various number of chronic diseases in men (n = 748; upper panel) and women (n = 397; lower panel). Values presented are means and 95% confidence intervals adjusted for handgrip strength, BMI, history of smoking, educational level and marital status. P values represent tests for linear trend in age across subjects with different number of chronic diseases. *0.01 < P ≤ 0.05; **P ≤ 0.01
