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Table 3 Overall Model Fit

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

Combined pre- and post-operative data Pre-operative only
  Separation Reliability Mean SD Mean SD
Person Ability 1.97 0.80 3.41 2.23 1.92 1.91
Item Difficulty 5.87 0.97 0.00a 0.77 0.00 0.78
  1. SD standard deviation
  2. athe mean item difficulty was set at 0.00 and the data were fit around this fixed value