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Table 4 Comparison of the two reliability coefficients for every domain and the overall scale for various test lengths

From: Reliability analysis of the Chinese version of the Functional Assessment of Cancer Therapy – Leukemia (FACT-Leu) scale based on multivariate generalizability theory

Domain Number of items G coefficient Ф coefficient
halfb originalb doubleb half original double half original double
PWB 4 7 14 0.794 0.871 0.931 0.763 0.849 0.918
SWB 4 7 14 0.717 0.816 0.899 0.696 0.800 0.889
EWB 3 6 12 0.608 0.756 0.861 0.555 0.714 0.833
FWB 4 7 14 0.756 0.845 0.916 0.726 0.823 0.903
LEUS 9 17 34 0.756 0.854 0.921 0.674 0.796 0.887
Overall scalea 24 44 88 0.903 0.945 0.972 0.877 0.928 0.963
  1. aFor the overall scale, the G coefficient is the composite G coefficient and the Ф coefficient is the composite Ф coefficient
  2. bhalf means the half test length, original means the original test length, and double means the double test length