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Table 2 Item statistics and internal consistency reliability of QLQ-CLL17

From: Validation of the Chinese EORTC chronic lymphocytic leukaemia module – application of classical test theory and item response theory

  N Range Mean sd %Ceiling %Floor Internal consistency reliability
Cronbach’s alpha Alpha if item deleted Item-total correlation
        0.92   
SB 318 0–100 30.01 17.85    0.81   
CLL1 318 1–4 1.68 0.63 2.51 41.82 0.78 0.56 0.62
CLL2 318 1–4 2.00 0.72 3.45 22.01 0.77 0.63 0.74
CLL3 318 1–4 1.82 0.73 2.52 34.28 0.76 0.64 0.75
CLL4 318 1–4 1.78 0.69 2.52 34.91 0.80 0.48 0.52
CLL5 318 1–4 2.22 0.81 5.97 17.92 0.76 0.63 0.70
CLL6 318 1–4 1.88 0.84 6.28 35.53 0.80 0.49 0.53
PC 318 0–100 30.45 19.82    0.85   
CLL7 318 1–4 1.66 0.70 2.20 45.28 0.85 0.59 0.64
CLL8 318 1–4 2.15 0.71 5.35 13.21 0.86 0.74 0.80
CLL9 318 1–4 1.88 0.71 1.88 29.56 0.82 0.68 0.74
CLL10 318 1–4 1.95 0.75 4.09 26.10 0.87 0.74 0.81
WF 318 0–100 56.66 26.74    0.91   
CLL11 318 1–4 2.75 0.94 27.98 6.92 0.88 0.82 0.86
CLL12 318 1–4 2.88 0.95 34.27 5.97 0.89 0.78 0.83
CLL13 318 1–4 2.78 0.94 28.94 6.29 0.89 0.81 0.85
CLL14 318 1–4 2.64 1.07 30.18 15.41 0.89 0.75 0.80
CLL15 318 1–4 2.94 0.94 35.53 5.35 0.89 0.81 0.85
CLL16 239 1–4 2.36 0.95 15.48 17.99 0.92 0.51 0.56
CLL17 243 1–4 2.56 1.05 25.51 17.28 0.91 0.63 0.68
  1. sd Standard deviation, SB symptom burden, PC physical condition/fatigue, WF Worries/fears about health and functioning