Statistical analysis
We then adjusted the association of gait speed with the primary outcome by using a multivariable Cox proportional hazards model adjusting for age, BMI and sex, and additionally adjusting for clinically relevant covariates (MV and CPB time). All tests for statistical significance were two-tailed with an alpha level of 0.05. Analyses were conducted using SPS version 20.0 and R version 2.14.113.
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