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Journal of Ophthalmic Inflammation and Infection

Table 1 Psychometric characteristics of NEI VFQ questionnaire in the sample, compared with the Rasch model requirements

From: Piloting Rasch model scoring of the National Eye Institute Visual Function Questionnaire in uveitis

 

Rasch model requirements

NEI VFQ

visual function

socioemotional

Misfitting items

0

1a

0

PSI

 > 2.0

2.34

2.52

PR

 > 0.8

0.85

0.86

Cronbach’s alpha

n/a

0.96

0.93

Targeting

 < 1 (< 2)

1.44

1.03

Unexplained variance in PCA

 < 2.0

1.83

2.48

  1. Deviations from literature recommendations are marked in bold
  2. n/a Not applicable, PCA Principal component analysis, PSI Person separation index, PR Person reliability
  3. aThe misfitting item was retained as its MNSQ value fell below a level that would compromise the measurement system
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