For the ST group, the
degree of improvement in PWT was highly correlated with
improvement in both the PAQ physical limitation score and
the WIQ distance domain (a 1-minute improvement in PWT
leads to an average improvement in PAQ of 4.1 and in WIQ
of 5.9; Pearson correlation r versus PWT is 0.65 for PAQ and
0.69 for WIQ; both P0.001).