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Table 2 Descriptive statistics of the EQ-5D index and the EORTC QLQ-C30 scales used in the derivation and validation sets

From: Mapping EORTC QLQ-C30 onto EQ-5D for the assessment of cancer patients

Variables Derivation set Validation set (n = 123)
n Mean (SD) Median (IQR) Mean (SD) Median (IQR)
EQ-5D index 893 0.824 (0.137) 0.854 (0.723–0.907) 0.871 (0.113) 0.87 (0.817–1.000)
EORTC QLQ-C30 functional scales    
 Global health status* 893 59.8 (21.9) 66.7 (25.0–50.0) 68.2 (22.5) 66.7 (50.0–83.3)
 Physical functioning* 893 72.1 (18.3) 73.3 (60.0–86.7) 79.2 (16.0) 80.0 (73.3–93.3)
 Role functioning* 893 68.2 (27.1) 66.7 (50.0–100) 77.2 (21.9) 83.3 (66.7–100)
 Emotional functioning* 893 70.9 (23.2) 75.0 (58.3–91.7) 79.8 (21.1) 83.3 (66.7–100)
 Cognitive functioning* 892 76.5 (20.8) 83.3 (66.7–100) 80.5 (19.4) 83.3 (66.7–100)
 Social functioning* 893 62.8 (28.2) 66.7 (50.0–83.3) 73.2 (23.0) 66.7 (66.7–100)
EORTC QLQ-C30 symptom scales/items    
 Fatigue* 893 40.6 (22.0) 33.3 (22.2–55.6) 33.0 (19.8) 33.3 (22.0–44.4)
 Nausea and vomiting* 893 22.5 (25.5) 16.7 (0.0–33.3) 14.9 (21.8) 0.0 (0.0–16.7)
 Pain* 893 28.8 (26.2) 16.7 (0.0–50.0) 17.1 (21.2) 16.7 (0.0–33.3)
 Dyspnea* 892 24.4 (26.8) 33.3 (0.0–33.3) 17.9 (21.9) 0.0 (0.0–33.3)
 Insomnia* 889 31.3 (30.6) 33.3 (0.0–33.3) 19.5 (23.7) 0.0 (0.0–33.3)
 Appetite loss* 889 31.8 (31.4) 33.3 (0.0–66.7) 18.4 (24.2) 0.0 (0.0–33.3)
 Constipation 892 26.1 (29.3) 33.3 (0.0–33.3) 20.9 (26.8) 0.0 (0.0–33.3)
 Diarrhea* 892 18.7 (26.0) 0.0 (0.0–33.3) 27.4 (28.6) 33.3 (0.0–33.3)
 Financial difficulties 892 37.9 (33.3) 33.3 (0.0–66.7) 31.7 (30.1) 33.3 (0.0–66.7)
  1. *p < 0.05; Student’s t test.