Table 1 Ceiling effect, KS-test results and Interquartile range of original and revised CHAQ.
| Â | Question-naire | Median score (range) | % at ceiling (0-score) | KS-statistic | P-value | IQR (P75-P25) |
|---|---|---|---|---|---|---|
Cat I | Chaq30orig | 0.50 (.00 – 2.50) | 20* | 1.23 | .10 | .06 |
|  | Chaq30item | 0.19 (.00 – 1.55) | 20* | 1.49 | .02 | .02 |
|  | Chaq38item | 0.26 (.00 – 1.70) | 9.5 | 1.24 | .09 | .03 |
Cat II | Chaq30item | -0.17 (-1.45 – 40) | 0 | 1.29 | .07 | .05 |
|  | Chaq38item | -0.24 (-1.52 – .42) | 0 | 1.04 | .23 | .25 |