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Table 1 Discrimination and difficulty abilities of BDDQ-AS items

From: French translation, cultural adaptation and validation of the BDDQ-AS for rhinoplasty patients

  Estimate 95% CI
BDDQ-AS 1
 Discrimination 2.52 1.51 3.54
 Difficulty 0.43 0.22 0.64
BDDQ-AS 2
 Discrimination 3.47 2.02 4.92
 Difficulty 0.48 0.29 0.66
BDDQ-AS 3    
 Discrimination 5.31 3.50 7.12
Difficulty
  > =2 0.31 0.16 0.47
  > =3 0.63 0.46 0.80
  > =4 1.33 1.07 1.58
 5 1.84 1.46 2.23
BDDQ-AS 4
 Discrimination 10.38 4.82 15.93
Difficulty
  > =2 0.49 0.34 0.63
  > =3 0.74 0.58 0.90
  > =4 1.21 0.99 1.44
 5 1.93 1.54 2.32
BDDQ-AS 5
 Discrimination 8.69 5.14 12.24
Difficulty
  > =2 0.44 0.29 0.59
  > =3 0.81 0.64 0.98
  > =4 1.36 1.11 1.61
 5 1.65 1.33 1.97
BDDQ-AS 6
 Discrimination 3.80 2.41 5.20
Difficulty
  > =2 0.77 0.57 0.96
  > =3 1.02 0.79 1.24
  > =4 1.53 1.19 1.86
 5 2.08 1.55 2.61
BDDQ-AS 7
 Discrimination 2.61 1.47 3.75
 Difficulty 0.83 0.59 1.08
  1. Hybrid models with 2-parameter logistic sub-models for BDDQ-AS 1, BDDQ-AS 2, and BDDQ-AS 7 and graded response sub-models (RSM) for BDDQ-AS 3, BDDQ-AS 4, BDDQ-AS 5, and BDDQ-AS 6 items. The p-values for all the estimates < 0.001