Table 3.

Adjusted mean values of skeletal muscle index and hand grip strength according to the frequency or duration of physical activities in men and women

	Men		Women
	Skeletal muscle index	Hand grip strength	Skeletal muscle index	Hand grip strength
Walking-only group	n = 866	n = 1684	n = 1075	n = 2243
Frequency
1-3	7.1 ± 0.05	32.35 ± 0.343	5.92 ± 0.058	19.65 ± 0.424
4-6	7.12 ± 0.062	32.9 ± 0.372	5.96 ± 0.064	20.13 ± 0.417
everyday	7.15 ± 0.045	32.97 ± 0.272	5.96 ± 0.06	20.57 ± 0.418
P	0.639	0.237	0.553	0.001
Duration
<3	7.03 ± 0.048	5.93 ± 0.057	32.08 ± 0.32	19.82 ± 0.414
3- <7	7.14 ± 0.052	5.93 ± 0.065	32.96 ± 0.345	20.43 ± 0.419
≥7	7.18 ± 0.046	5.95 ± 0.061	33.36 ± 0.28	20.53 ± 0.441
P	0.013	0.878	0.001	0.008
Moderate PA group	n = 426	n = 603	n = 567	n = 469
Frequency
1-3	7.19 ± 0.062	33.85 ± 0.605	6.11 ± 0.068	21.29 ± 0.976
4-6	7.21 ± 0.081	34.87 ± 0.66	6.05 ± 0.076	22.07 ± 0.969
everyday	7.3 ± 0.058	34.78 ± 0.645	6.13 ± 0.08	21.33 ± 1.014
P	0.273	0.218	0.488	0.152
Duration
<3	7.16 ± 0.073	6.06 ± 0.07	33.85 ± 0.577	21.01 ± 0.916
3- <7	7.26 ± 0.058	6.07 ± 0.072	34.46 ± 0.729	21.96 ± 0.961
≥7	7.24 ± 0.061	6.2 ± 0.082	35.57 ± 0.725	22.04 ± 1.025
P	0.424	0.072	0.073	0.030
Vigorous PA group	n = 475	n = 227	n = 408	n = 97
Frequency
1-3	7.45 ± 0.057	36.84 ± 0.73	5.94 ± 0.09	22.23 ± 0.932
4-6	7.39 ± 0.082	37.47 ± 0.947	6.08 ± 0.108	24.99 ± 1.051
everyday	7.45 ± 0.076	38.55 ± 1.153	6.07 ± 0.119	21.94 ± 1.429
P	0.748	0.369	0.058	0.011
Duration
<3	7.41 ± 0.076	5.76 ± 0.09	36.54 ± 0.688	24.15 ± 0.851
3- <7	7.43 ± 0.058	6.06 ± 0.096	37.1 ± 0.853	23.00 ± 1.248
≥7	7.47 ± 0.07	6.08 ± 0.095	39.57 ± 1.124	24.69 ± 1.389
P	0.792	<0.001	0.027	0.404

Linear regression analysis adjusted with age, BMI, smoking, alcohol intake, total energy intake, total protein intake, total fat intake, monthly household income, education level and diabetes