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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

 NRangeMeansd%Ceiling%FloorInternal consistency reliability
Cronbach’s alphaAlpha if item deletedItem-total correlation
       0.92  
SB3180–10030.0117.85  0.81  
CLL13181–41.680.632.5141.820.780.560.62
CLL23181–42.000.723.4522.010.770.630.74
CLL33181–41.820.732.5234.280.760.640.75
CLL43181–41.780.692.5234.910.800.480.52
CLL53181–42.220.815.9717.920.760.630.70
CLL63181–41.880.846.2835.530.800.490.53
PC3180–10030.4519.82  0.85  
CLL73181–41.660.702.2045.280.850.590.64
CLL83181–42.150.715.3513.210.860.740.80
CLL93181–41.880.711.8829.560.820.680.74
CLL103181–41.950.754.0926.100.870.740.81
WF3180–10056.6626.74  0.91  
CLL113181–42.750.9427.986.920.880.820.86
CLL123181–42.880.9534.275.970.890.780.83
CLL133181–42.780.9428.946.290.890.810.85
CLL143181–42.641.0730.1815.410.890.750.80
CLL153181–42.940.9435.535.350.890.810.85
CLL162391–42.360.9515.4817.990.920.510.56
CLL172431–42.561.0525.5117.280.910.630.68
  1. sd Standard deviation, SB symptom burden, PC physical condition/fatigue, WF Worries/fears about health and functioning