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Table 4 Validation resulta

From: Item reduction and validation of the Chinese version of diabetes quality-of-life measure (DQOL)

  Confirmatory factor analysis Spearman correlation coefficient
  SRMR CFI ρ(EQ-5D-3L) ρ(EQ-VAS)
Short version based on the CTT (32 items) 0.078 0.630 −0.298 −0.288
 Domain 1    −0.260 −0.260
 Domain 2    −0.069 −0.148
Short version based on the IRT (24 items) 0.078 0.726 −0.288 −0.269
 Domain 1    −0.240 −0.242
 Domain 2    −0.069 −0.148
Original Chinese DQOL (46 items) 0.077 0.616 −0.276 −0.273
  1. aCalculations based on a total of 1350 observations without missing values on all the five EQ-5D-3 L questions and all the 46 DQOL items
  2. CTT Classical test theory, IRT Item response theory, DQOL Diabetes quality-of-life measure, SRMR Standardized root mean squared residual, CFI Comparative fit index, ρ Spearman’s correlation coefficient, VAS Visual analogue scale