Six-minute walk, meters  400-meter LDCW, minutes
  Model Slope (ml/kg/min/m) Model Slope (ml/kg/min/min)  
Subjects N R2 RMSE β SE p* N R2 RMSE β SE p*
HIV-infected 45 0.25 5.51 0.047 0.013 0.9 43 0.27 5.56 -6.35 1.64 0.8
Uninfected 37 0.32 4.56 0.048 0.012   35 0.23 4.90 -4.87 1.54  
* difference in slope between models by the F-statistic
p-value <0.01 for linear regression β coefficient
RMSE, root mean squared error
Table 3: Association of VO2peak (ml/kg/min) with performance in the six-minute walk and the 400-meter long-distance corridor walk (LDCW) by linear regression in HIVinfected and uninfected men.
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