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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