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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