Research Article
Reliability and Validity of the Greek QLQ-C30 and QLQ-MY20 for Measuring Quality of Life in Patients with Multiple Myeloma
Table 1
Central tendency, variability, and reliability of the QLQ-C30 and QLQ-MY20 scales.
| | No. of Items | Mean (SD) | 95% CI | Median | Floor (%) | Ceiling (%) | Reliabilitya |
| QLQ-C30 | | | | | | | | Global health status/QoL | 2 | 62.6 (21.6) | 58.1–67.2 | 66.7 | 0.0 (3.4) | 100.0 (5.6) | 0.92 | Functional scales | | | | | | | | Physical functioning | 5 | 64.0 (22.3) | 59.3–68.7 | 66.7 | 0.0 (1.1) | 100.0 (4.5) | 0.80 | Role functioning | 2 | 68.9 (33.9) | 61.8–76.1 | 66.7 | 0.0 (10.1) | 100.0 (41.6) | 0.90 | Emotional functioning | 4 | 71.5 (25.1) | 66.3–76.8 | 75.0 | 0.0 (2.2) | 100.0 (12.4) | 0.84 | Cognitive functioning | 2 | 81.7 (23.8) | 76.6–86.7 | 83.3 | 0.0 (1.1) | 100.0 (48.3) | 0.57 | Social functioning | 2 | 79.0 (25.2) | 73.7–84.3 | 83.3 | 16.7 (4.5) | 100.0 (46.1) | 0.77 | Symptom scales/items | | | | | | | | Fatigue | 3 | 41.3 (27.6) | 35.5–47.1 | 33.3 | 0.0 (10.1) | 100.0 (4.5) | 0.89 | Nausea and vomiting | 2 | 8.2 (20.4) | 3.9–12.5 | 0.0 | 0.0 (82.0) | 100.0 (1.1) | 0.74 | Pain | 2 | 29.8 (27.8) | 23.9–35.6 | 33.3 | 0.0 (30.3) | 100.0 (3.4) | 0.80 | Dyspnoea | 1 | 34.5 (32.4) | 27.6–41.3 | 33.3 | 0.0 (34.8) | 100.0 (10.1) | — | Insomnia | 1 | 32.6 (36.2) | 25.0–40.2 | 33.3 | 0.0 (46.1) | 100.0 (13.5) | — | Appetite loss | 1 | 13.9 (29.2) | 7.7–20.0 | 0.0 | 0.0 (77.5) | 100.0 (6.7) | — | Constipation | 1 | 22.9 (32.8) | 15.9–29.8 | 0.0 | 0.0 (58.4) | 100.0 (10.1) | — | Diarrhea | 1 | 9.4 (18.1) | 5.6–13.2 | 0.0 | 0.0 (75.3) | 100.0 (1.1) | — | Financial difficulties | 1 | 12.0 (22.6) | 7.2–16.8 | 0.0 | 0.0 (74.2) | 100.0 (1.1) | — |
| QLQ-MY20 | | | | | | | | Disease symptoms | 6 | 20.2 (19.8) | 16.0–24.3 | 16.7 | 0.0 (25.8) | 83.3 (1.1) | 0.77 | Side effects of treatment | 10 | 20.1 (15.5) | 16.8–23.3 | 18.5 | 0.0 (5.6) | 70.4 (1.1) | 0.72 | Body image | 1 | 72.3 (34.5) | 65.0–79.6 | 100.0 | 0.0 (9.0) | 100.0 (53.9) | — | Future perspective | 3 | 54.6 (29.8) | 48.3–60.8 | 55.6 | 0.0 (7.9) | 100.0 (10.1) | 0.80 |
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aCronbach’s alpha.
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