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Table 3 Estimations of minimum important difference (MID) in each group

From: Self-assessed visual function outcome in cataract surgery: minimum important difference of the Catquest-9SF questionnaire

Means of MID estimation

Group 1

Group 2

Anchor question

 − 0.5

 − 1.80

Cohen’s effect size

 − 1.07

 − 1.46

Approximation of true MID (mean of the above)

 − 0.79

 − 1.63

  1. Group 1 comprises patients with a preoperative Rasch score of − 4.91 to − 1.50; that is, the group with better preoperative self-assessed visual function. Group 2 comprises patients with a preoperative Rasch score of − 1.49 to 5.73; that is, the group with worse preoperative self-assessed visual function
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Eye and Vision

ISSN: 2326-0254