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Table 3 Univariate and multiple stepwise regression analysis for the knee extension strength

From: Carnitine deficiency is associated with decreased exercise activity in hemodialysis patients

Variables Univariate Multiple stepwise regression
β SE P value β SE P value
Age − .111 − .122 0.513    
Sex − .530 2.80 0.001 − .397 2.448 <  0.0001
BMI .071 .409 0.675    
HD duration .119 .024 0.483    
Hemoglobin .082 1.048 0.630    
Serum albumin .054 6.825 0.755    
AST − .038 .214 0.821    
ALT .052 .223 0.760    
BUN .259 .111 0.122    
Serum Cr .599 .556 < 0.0001 .599 .556 < 0.0001
Uric acid .223 1.017 0.185    
Corrected Ca .229 2.641 0.173    
Phosphate .233 1.200 0.165    
Total chol − .068 .055 0.688    
HDL-chol .064 .121 0.707    
LDL-chol .021 .077 0.903    
Triglycerides − .241 .017 0.151    
CRP − .105 5.593 0.534    
Whole PTH .187 .017 0.269    
NT-pro BNP − .013 .000 0.434    
Free carnitine .359 .209 0.029    
Kt/V − .359 4.383 0.029    
  1. β standardized regression coefficients, SE standard error. r2 = 0.506
  2. BMI body mass index, HD hemodialysis, ALT alanine amino transferase, AST aspartate transaminase, Cr creatinine, Ca calcium, HDL-chol high-density lipoprotein cholesterol, LDL-chol low-density lipoprotein cholesterol, CRP C-reactive protein, Whole PTH whole parathyroid hormone, NT-pro BNP N-terminal pro B-type natriuretic peptide