Table 2 Score distributions, internal consistency, and missing responses on the CQ7: overall sample and patient and control groups (baseline visit).
CQ7: overall sample | CQ7: Patients | CQ7: Controls | |
|---|---|---|---|
(n = 201) | (n = 166) | (n = 35) | |
Missing responses*, n | 0 | 0 | 0 |
Theoretical score range | 0 - 28 | 0 - 28 | 0 - 28 |
Observed score range | 0 - 25 | 0 - 25 | 0 - 16 |
Mean (SD) score on CQ7 | 14.5 (5.6) | 15.9 (5.2) | 3.6 (4.3) |
Cronbach's alpha | 0.92 | 0.86 | 0.89 |
Ceiling effect (%) a | 1.0 | 1.2 | 2.9 |
Floor effect (%) b | 7.0 | 0.6 | 37.1 |