Fig. 3From: Self-assessed visual function outcome in cataract surgery: minimum important difference of the Catquest-9SF questionnaireScatter plot showing improvement in Rasch score and answers to anchor question in Group 2. Group 2 comprises patients with a pre-operative Rasch score of − 1.49 to 5.73. The central line in the scatterplot is a line of best fit using the least squares method and the upper and lower lines represent 95% confidence intervalsBack to article page