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Table 2 Fit statistics and Rasch measure of item difficulty for the Catquest-9SF items

From: Validity of the French version of Catquest-9SF and use of an electronic notepad for entering patient-reported outcome measures

Item

Infit mean square

Outfit mean square

Rasch measure

A - Difficulties in any way in daily life

0.70

0.74

−0.60

B - Satisfaction with vision

1.00

1.00

−2.21

C1 - Reading text in the newspaper

1.08

1.07

−0.40

C2 - Recognizing faces

1.32

1.25

1.59

C3 - Seeing prices

0.81

0.81

0.13

C4 - Seeing to walk on uneven ground

1.14

1.12

1.18

C5 - Seeing to do needlework etc.

0.96

0.94

0.12

C6 - Reading text on TV

1.14

1.13

−0.70

C7 - Seeing to carry out a preferred hobby

0.94

0.87

0.88