(a)

	Mean (SD)	r	P value
Sex: males = 205; females = 231		−0.017	0.722
Age (years)	71 ± 8.6	−0.290	<0.001
Total physical activity	405.8 ± 201.0	0.029	0.547
Light activity	186.1 ± 82.6	0.057	0.235
Moderate activity	115.1 ± 91.1	0.030	0.530
Heavy activity	104.6 ± 141.3	−0.012	0.810
BMI	26 ± 3.9	−0.094	0.052
Sum of skinfolds	56.0 ± 20.5	0.013	0.825
Plantar flexion strength	879.5 ± 322.9	0.197	<0.001
Handgrip strength	292.1 ± 112.7	0.126	<0.001
Arthritis: no = 107; yes = 108		−0.022	0.752

BMI: body mass index; self-reported arthritis data available for 215 subjects.