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Table 2 Model-fit results of confirmatory factor analysis (CFA) of extended item bank (51 items), final item bank (28 items) and short-form 8b (8 items) of the PROMIS Depression Item Bank using WLSMVa,b

From: Psychometric evaluation of the PROMIS® Depression Item Bank: an illustration of classical test theory methods

Modelχ2 valuedfpRMSEA [90% CI]CFITLI
Unidimensional model with 51 items5729.61224<.0010.070 [0.068; 0.072]0.9530.951
Unidimensional model with 28 items1473.27350<.0010.065 [0.062; 0.069]0.9830.982
Unidimensional model with 8 items177.7120<.0010.101 [0.088; 0.115]0.9950.992
  1. aWLSMV: robust weighted least squares
  2. bSample size for the models with 51, 28 and 8 items, respectively, was N = 753
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