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Overall Model Fit
| 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 |
SD standard deviation
athe mean item difficulty was set at 0.00 and the data were fit around this fixed value
