Table 3. Multiple linear regression analysis of the factors related with hand grip and leg muscle strength.

Variables		Total		Age < 60		Age ≥ 60		Male		Female		HD vintage < 34		HD vintage ≥ 34
		SC	P value	SC	P value	SC	P value	SC	P value	SC	P value	SC	P value	SC	P value
Hand grip strength
	Sex (female)	−0.521	< 0.001	−0.365	0.132	−0.545	< 0.001					−0.38	0.029	−0.68	< 0.001
	Age, yr	−0.265	0.004					−0.245	0.037	−0.459	0.101	−0.327	0.021	0.012	0.933
	HD vintage, mon	−0.171	0.051	−0.163	0.398	−0.222	0.054	−0.211	0.054	0.166	0.484
	Exercise, home- or hospital-based (yes)	0.314	0.001	0.22	0.233	0.362	0.010	0.354	0.004	−0.148	0.667	0.446	0.004	0.081	0.600
	BMI, kg/m2	0.08	0.400	−0.01	0.957	0.14	0.259	0.05	0.670	0.523	0.068	0.037	0.790	0.135	0.340
	Kt/V	0.068	0.571	−0.123	0.646	0.142	0.341	0.088	0.495	−0.431	0.194	−0.025	0.879	0.322	0.077
	Serum albumin, g/dL	0.024	0.884	0.207	0.465	−0.004	0.973	−0.004	0.967	0.057	0.864	0.01	0.938	0.184	0.247
	Serum creatinine, mg/dL	0.013	0.112	0.162	0.438	0.84	0.128	0.217	0.071	0.11	0.637	0.147	0.310	0.169	0.244
	hs-CRP, mg/dL	−0.062	0.502	−0.047	0.821	−0.065	0.619	−0.038	0.745	−0.693	0.035	−0.012	0.932	−0.02	0.889
	Serum calcium, mg/dL	−0.013	0.892	0.116	0.587	−0.173	0.191	−0.003	0.981	−0.416	0.106	−0.069	0.662	0.011	0.941
	Iron, μg/dL	−0.044	0.610	−0.105	0.523	−0.043	0.966	−0.006	0.954	−0.288	0.164	0.08	0.562	−0.024	0.851
Leg muscle strength
	Sex (female)	−0.421	0.001	−0.135	0.585	−0.478	0.007					−0.356	0.050	−0.542	0.008
	Age, yr	−0.368	< 0.001					−0.384	0.003	−0.488	0.164	−0.5	0.001	−0.13	0.833
	HD vintage (months)	−0.051	0.611	0.046	0.826	−0.093	0.504	−0.051	0.670	0.261	0.425
	Exercise, home- or hospital-based (yes)	0.234	0.026	0.212	0.268	0.318	0.048	0.273	0.031			0.299	0.059	0.157	0.320
	BMI, kg/m2	0.108	0.330	0.242	0.241	0.013	0.934	0.087	0.505	0.288	0.450	0.203	0.174	−0.093	0.607
	Kt/V	−0.02	0.884	−0.327	0.225	0.091	0.629	−0.031	0.831	−0.39	0.517	0.142	0.420	−0.118	0.585
	Serum albumin, g/dL	0.021	0.830	0.389	0.203	−0.07	0.615	0.018	0.879	0.165	0.712	0.06	0.668	0.262	0.201
	Serum creatinine, mg/dL	0.126	0.250	0.067	0.770	0.123	0.430	0.186	0.159	−0.183	0.500	0.165	0.293	0.045	0.789
	hs-CRP, mg/dL	0.036	0.727	0.068	0.750	0.124	0.416	0.095	0.457	−0.309	0.323	0.115	0.446	0.045	0.792
	Serum calcium, mg/dL	0.01	0.928	−0.233	0.313	0.089	0.566	0.016	0.908	−0.191	0.616	−0.139	0.380	0.07	0.689
	Iron, μg/dL	−0.012	0.903	−0.141	0.424	0.193	0.178	0.071	0.565	−0.443	0.092	0.005	0.974	−0.003	0.984

Units of age and HD vintage are years and months, respectively.

BMI = body mass index, hs-CRP = highly sensitive C-reactive protein, SC = standardized coefficient.