Table 3.
Discriminative validity of different CHAQ revisions compared to the original CHAQ.
| T-test | Mann-Whitney U-test | |||||||
|---|---|---|---|---|---|---|---|---|
| CHAQ version | Score patients | Score controls | T statistic | P | U statistic | Z score | P | relative efficiency |
| CHAQ30orig | 0.38 (0-2.13) | 0 (0-0.63) | -7.52 (df 109) | <0.001 | 344 | -4.84 | <0.001 | 1.00 |
| CHAQ30CATI | 0.10 (0-1.62) | 0 (0-0.23) | -6.90 (df 102) | <0.001 | 333 | -4.92 | <0.001 | 0.84 |
| CHAQ38CATI | 0.19 (0-1.84) | 0 (0-0.26) | -7.56 (df 101) | <0.001 | 263 | -5.33 | <0.001 | 1.01 |
| CHAQ30CATII | -0.033 (-1.69-2) | 0 (-0.026-0.071) | 2.37 (df 90) | 0.02 | 509 | -3.54 | <0.001 | 0.10 |
| CHAQ38CATII | -0.12 (-1.7-1.76) | 0.013 (-0.052-0.42) | 3.78 (df 107) | <0.001 | 403 | -4.28 | <0.001 | 0.25 |
CHAQ scores for patients and controls are shown as median and range. Relative efficiency is the ratio of squared t-statistic with the original CHAQ (chaq30orig) as reference.