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Table 3 Summary statistics for person and item parameters of the Catquest-9SF

From: Catquest-9SF questionnaire: validation of Malay and Chinese-language versions using Rasch analysis

Version   Parameter Separation index Reliability Average infit mean square Average outfit mean square
Malay 9-items Person ability 2.84 0.89 1.00 1.01
Item difficulty 4.81 0.96 1.00 1.00
7-itemsa Person ability 2.59 0.87 1.00 0.99
Item difficulty 4.97 0.96 1.00 0.98
Chinese 9-items Person ability 2.59 0.87 1.00 1.01
Item difficulty 6.96 0.98 1.00 1.02
7-itemsa Person ability 2.30 0.84 1.01 0.98
Item difficulty 5.28 0.97 1.00 0.98
  1. a7-items excluding 2 global assessment questions