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Table 3 Fit statistics for PHQ-9 items (collapsed across sample size) for the Rating Scale Model

From: Rasch fit statistics and sample size considerations for polytomous data

   Infit MNSQ SE Infit t SE Outfit MNSQ SE Outfit t SE
  PHQ1 1.01 0.01 0.33 0.09 1.02 0.02 0.30 0.13
  PHQ2 0.72 0.01 -4.04 0.08 0.71 0.01 -3.36 0.07
  PHQ3 1.14 0.01 2.39 0.09 1.15 0.02 2.25 0.11
  PHQ4 0.87 0.01 -2.09 0.09 0.93 0.01 -0.82 0.09
  PHQ5 1.37 0.01 4.19 0.08 1.28 0.02 2.46 0.08
  PHQ6 1.10 0.01 1.27 0.08 0.95 0.02 -0.42 0.07
  PHQ7 1.04 0.01 0.60 0.08 0.86 0.01 -1.16 0.06
  PHQ8 1.25 0.02 2.46 0.08 0.97 0.02 -0.08 0.07
  PHQ9 1.17 0.03 1.48 0.10 0.84 0.05 -0.87 0.08
Underfit >1.30 1.00 >2 3.00 >1.30 0 >2 2.00  
Overfit <0.70 0 <-2 2.00 <0.70 0 <-2 1.00