Table 3.
Baseline ceiling, floor effects, and Cronbach’s alpha coefficients of the KCCQ and SF-36 scales, MAHFER study
| HQOL measure | Mean (SD) | Median (IQR) | % Floor effect | % Ceiling effect | Inter-item correlation | Cronbach’s alpha coefficients |
|---|---|---|---|---|---|---|
| KCCQ | ||||||
| Physical limitation | 12.6 (18.9) | 0 (0, 25) | 59.9 | 2.5 | 0.46 | 0.83 |
| Symptom stability | 51.5 (21.1) | 55 (30, 70) | 0.1 | 8.7 | 0.51 | 0.86 |
| Symptom frequency | 38.4 (22.9) | 31 (25, 50) | 3.5 | 1.0 | 0.39 | 0.79 |
| Symptom burden | 40.6 (24.7) | 33 (25, 50) | 3.5 | 3.0 | 0.40 | 0.80 |
| Total symptom score | 39.5 (23.8) | 33 (25, 50) | 3.5 | 1.0 | 0.48 | 0.85 |
| Self-efficacy | 58.7 (21.7) | 75 (50, 75) | 23.5 | 10.4 | 0.47 | 0.84 |
| Quality of life | 23.1 (16.1) | 25 (12, 25) | 14.8 | 1.0 | 0.45 | 0.83 |
| Social limitation | 11.9 (18.7) | 0 (0, 25) | 61.7 | 2.0 | 0.99 | 0.99 |
| Clinical summary score | 26.0 (18.6) | 20 (12, 38) | 3.55 | 0.5 | 0.58 | 0.87 |
| SF-36 | ||||||
| Physical functioning | 23.6 (18.5) | 20 (5, 40) | 0.5 | 3.7 | 0.30 | 0.78 |
| Physical limitation | 4.4 (15.5) | 0 (0, 0) | 89.1 | 3.6 | 0.28 | 0.75 |
| Emotional limitation | 9.6 (14.4) | 12.5 (0, 12) | 48.7 | 3.7 | 0.27 | 0.75 |
| Bodily pain | 24.5 (19.9) | 10 (10, 42) | 7.5 | 23.7 | 0.29 | 0.76 |
| General health | 39.8 (10.7) | 40 (30, 45) | 2.1 | 4.7 | 0.35 | 0.81 |
| Mental health | 32.3 (9.3) | 32 (26, 38) | 1.0 | 99 | 0.29 | 0.77 |
| Social functioning | 40.9 (20.1) | 37 (25, 62) | 23.3 | 92.2 | 0.31 | 0.79 |
| Energy fatigue | 38.5 (15.3) | 35 (30, 50) | 0.5 | 3.6 | 0.34 | 0.81 |
| Physical health | 22.7 (10.8) | 21 (16, 26) | 1.3 | 26.1 | 0.23 | 0.71 |