Table 3.

Univariable and multivariable analysis for the effects of physical activity time on survival

VariableUnits of IncreaseUnivariable AnalysisaMultivariable Analysis: Model 1bMultivariable Analysis: Model 2c
HR (95% CI)P ValueHR (95% CI)P ValueHR (95% CI)P Value
Physical activity time10 min/d0.72 (0.62–0.85)<0.0010.78 (0.65–0.93)0.0060.78 (0.66–0.92)0.002
Age1 yr1.08 (1.04–1.11)<0.0011.05 (1.00–1.10)0.04
Women (versus men)0.67 (0.34–1.32)0.240.84 (0.40–1.76)0.65
Body mass index1 kg/m20.93 (0.82–1.05)0.250.96 (0.84–1.09)0.49
Time on hemodialysis1 mo1.00 (0.99–1.00)0.651.00 (1.00–1.01)0.36
Comorbidity score11.22 (1.10–1.35)<0.0011.10 (0.98–1.23)0.11
Serum albumin0.1 g/dl0.93 (0.84–1.04)0.221.08 (0.95–1.22)0.23
Serum C-reactive protein0.1 mg/dl1.09 (1.05–1.12)<0.0011.08 (1.05–1.13)<0.001
Propensity score0.63 (0.47–0.85)0.002
  • Analyses were performed using Cox proportional hazards regression. HR, hazard ratio; CI, confidence interval.

  • a Unadjusted by clinicopathologic factors on survival.

  • b Adjusted by age, sex, body mass index, time on hemodialysis, comorbidity score, and levels of serum albumin and C-reactive protein.

  • c Adjusted by applying a propensity score, which is a conditional probability of expressing physical activity time given by other clinicopathologic factors.