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Table 1 Descriptive statistics and scale reliability of the QLQ-C30

From: The validation of the standard Chinese version of the European Organization for Research and Treatment of Cancer Quality of Life Core Questionnaire 30 (EORTC QLQ-C30) in pre-operative patients with brain tumor in China

  Items* Mean Median Mode SD Cronbach's alpha
coefficient$
Functioning scales^       
PF 1-5 81.0 86.7 100.0 23.23 0.88
RF 6, 7 79.4 100.0 100.0 28.30 0.91
EF 21-24 78.0 83.3 100.0 18.40 0.80
CF 20, 25 76.2 83.3 100.0 20.95 0.33
SF 26, 27 70.7 66.7 100.0 27.74 0.80
QL 29, 30 54.7 58.3 67.0 26.55 0.85
Symptom scales and/or items§       
FA 10, 12, 18 31.2 33.3 33.0 23.71 0.81
NV 14, 15 11.3 0.0 0.0 20.91 0.84
PA 9, 19 26.5 16.7 0.0 26.33 0.75
DY 8 10.8 0.0 0.0 19.72  
SL 11 18.5 0.0 0.0 28.60  
AP 13 19.9 0.0 0.0 28.09  
CO 16 14.5 0.0 0.0 24.19  
DI 17 2.8 0.0 0.0 10.03  
FI 28 47.1 33.3 33.0 36.33  
  1. * Numbers correspond to the item numbers in the questionnaire.
  2. $ Alpha values >.70 indicate adequate scale reliability.
  3. ^ Scores range from 0 to 100, with a higher score representing a higher level of functioning.
  4. §Scores range from 0 to 100, with a higher score representing a greater degree of symptoms.
  5. Abbreviations: AP Appetite loss, CF Cognitive functioning; CO Constipation; DI Diarrhoea; DY Dyspnoea; EF Emotional functioning; FA Fatigue; FI Financial difficulties; NV Nausea and vomiting; PA Pain; PF physical function; QL Global health status; RF role function; SF Social functioning; SD standard deviation; SL Insomnia