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Table 4 Item fit statistics for the Catquest-9SF

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

Item Malay version Chinese version
Item calibrationa (SE) Infit Outfit Item calibrationa (SE) Infit Outfit
MNSQ ZSTD MNSQ ZSTD MNSQ ZSTD MNSQ ZSTD
Assessment items:
1. Do you experience that your present vision gives you difficulties in any way in your daily life? −0.16 (0.11) 0.97 −0.3 0.99 −0.1 0.19 (0.13) 1.09 0.9 1.10 1.0
2. Are you satisfied or dissatisfied with your present vision? −0.77 (0.11) 1.26 2.6 1.51 4.1 −2.05 (0.13) 1.01 0.2 1.36 2.3
Do you have difficulty with the following activities because of your vision?
1. Reading text in the newspaper −0.81 (0.11) 0.85 −1.6 0.81 −1.8 −0.66 (0.13) 1.12 1.2 1.09 0.9
2. Recognizing faces of people you meet 0.83 (0.11) 1.02 0.3 1.01 0.1 1.18 (0.14) 1.13 1.3 1.12 1.1
3. Seeing prices of goods when shopping −0.34 (0.11) 1.09 0.9 1.04 0.5 −0.67 (0.13) 0.93 −0.7 0.91 −0.8
4. Seeing to walk on uneven ground 0.34 (0.11) 1.01 0.2 1.01 0.1 1.12 (0.14) 1.06 0.6 0.97 −0.2
5. Seeing to do needlework and handicraft 0.03 (0.12) 1.01 0.2 0.97 −0.2 0.11 (0.14) 0.97 −0.2 0.93 −0.6
6. Reading text on television 0.07 (0.11) 0.89 −1.1 0.85 −1.5 −0.01 (0.13) 0.98 −0.1 0.97 −0.3
7. Seeing to carry out a preferred hobby 0.82 (0.11) 0.86 −1.5 0.80 −2.0 0.79 (0.14) 0.73 −2.8 0.71 −2.9
  1. SE standard error, MNSQ mean square, ZSTD standardized fit statistic
  2. aMeasured in logit; positive item logit indicates that the item requires a lower visual ability than the mean of the items and is an easier item; while a negative item logit indicates that the item requires a higher visual ability than the mean of the items and is a more difficult item