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Table 6 Discrimination and difficulty parameters for QLQ-CLL17

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

 DiscriminationThreshold indicesS-χ2P value
ab1b2b3
SB
 CLL11.265−0.2862.3892.21413.520.330
 CLL23.112−0.8600.9922.06217.020.074
 CLL33.166−0.4401.2032.26611.650.309
 CLL40.880−0.6922.6342.5159.640.885
 CLL51.279−1.3170.6342.31919.860.281
 CLL60.761−0.5792.2161.69719.760.409
PC
 CLL71.515−0.2901.9792.34016.520.050
 CLL83.655−1.2260.7971.7276.160.291
 CLL92.603−0.6241.1742.4653.770.438
 CLL103.531−0.6991.0531.8662.180.704
WF
 CLL113.702−1.58−0.1210.55710.530.65
 CLL123.624−1.667−0.2660.35419.680.103
 CLL133.568−1.647−0.1520.52612.620.478
 CLL142.573−1.1430.0980.39510.860.900
 CLL153.877−1.707−0.3740.32912.880.458
 CLL160.776−1.4131.0431.26819.510.882
 CLL171.022−1.1500.4730.53128.590.330
  1. SB symptom burden, PC physical condition/fatigue, WF Worries/fears about health and functioning, a = discrimination, b = difficulty