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Table 2 Item Parameter Estimates and Fit Statistics

From: Development of a rapid point-of-care patient reported outcome measure for cataract surgery in India

Item Item location Infit MNSQ Outfit MNSQ Polyserial item-test correlation
1. Problem climbing stairs −0.49 0.90 0.63 0.59
2. Problem making out bumps 0.14 0.87 0.76 0.69
3. Problem seeing animals or vehicles −0.15 0.77 0.56 0.66
4. Problem recognizing faces −0.27 0.97 0.69 0.58
5. Problem seeing outside in bright light 1.20 1.00 0.94 0.75
6. Frightened to go out −1.00 0.99 1.06 0.59
7. Enjoy social functions less −0.37 0.94 0.81 0.55
8. Ashamed can’t see −0.75 1.06 1.00 0.60
9. Dazzled in bright light 1.38 1.29 1.30 0.70
10. Vision blurred in sunlight −0.18 0.76 0.69 0.77
11. Bright light hurt eyesa 0.03 1.53 2.32 0.48
12. Blurred vision 0.45 0.87 0.87 0.82
  1. MNSQ mean-square
  2. aitem removed to form 11-item SF-IND-VFQ