Table 2.
WIQ scores categorized by treadmill walking performance as measured by the ACD.
| n | Low | Medium | High | All | P | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |||
| Absolute claudication distance (meters) | 123 | 103.0 | 32.0 | 296.8 | 79.2 | 849.9 | 423.0 | 416.5 | 402.5 | <0.0001∗ |
| Peak walking time (seconds) | 123 | 137.6 | 36.0 | 354.4 | 88.6 | 973.0 | 473.1 | 488.4 | 450.2 | <0.0001∗ |
| WIQ-distance | 119 | 18.3 | 19.4 | 38.4 | 25.3 | 59.7 | 27.8 | 39.5 | 30.2 | <0.0001∗ |
| WIQ-speed | 119 | 27.9 | 20.6 | 49.9 | 25.8 | 61.3 | 24.9 | 47.6 | 28.0 | <0.0001† |
| WIQ-stair | 109 | 37.5 | 21.3 | 61.4 | 26.9 | 73.8 | 23.0 | 58.0 | 27.8 | <0.0001† |
| WIQ-distance and speed | 115 | 23.2 | 19.2 | 44.6 | 22.0 | 60.1 | 23.7 | 39.5 | 30.2 | <0.0001∗ |
| WIQ-overall | 102 | 26.9 | 13.8 | 52.0 | 21.2 | 65.0 | 20.6 | 47.6 | 28.0 | <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.