Table 2: WIQ scores categorized by treadmill walking performance as measured by the ACD.

nLowMediumHighAllP
MeanSDMeanSDMeanSDMeanSD

Absolute claudication distance (meters)123103.032.0296.879.2849.9423.0416.5402.5<0.0001*
Peak walking time (seconds)123137.636.0354.488.6973.0473.1488.4450.2<0.0001*
WIQ-distance11918.319.438.425.359.727.839.530.2<0.0001*
WIQ-speed11927.920.649.925.861.324.947.628.0<0.0001
WIQ-stair10937.521.361.426.973.823.058.027.8<0.0001
WIQ-distance and speed11523.219.244.622.060.123.739.530.2<0.0001*
WIQ-overall10226.913.852.021.265.020.647.628.0<0.0001*

SD: standard deviation.
Low (<159.89 meters), medium (159.89–415.89 meters), high (>415.89 meters) categories are based on thirds of the population divided by tertiles of ACD.
P  value: ANOVA test.
*Significant difference between all groups using Bonferroni method.
Significant difference between all groups except medium and high using Bonferroni method.
Note: sample sizes vary for each subscore based on the number who had fewer than half missing values for that subscores. If any of the subscores were missing the overall score was coded as missing.