Table 4.
MCAT performance measures and item reduction on general HRQOL factor for each simulation
| Simulation | Mean number of administered items, median (interquartile range) | Item reduction | Mean SE (range) | Correlation between  and θ
|
RMSD |
|---|---|---|---|---|---|
| Full | 44 | - | 0.28 (0.26–0.43) | 0.96 | 0.29 |
| 1 | 44 | 0 | 0.28 (0.26–0.43) | 0.96 | 0.29 |
| 2 | 31, 35 (21–42) | 28.7% | 0.31 (0.26–0.55) | 0.94 | 0.32 |
| 3 | 26, 24 (22–29) | 41.1% | 0.31 (0.29–0.43) | 0.94 | 0.32 |
| 4 | 23, 22 (20–27) | 48.5% | 0.33 (0.29–0.55) | 0.94 | 0.34 |
| 5 | 44 | 0 | 0.28 (0.26–0.43) | 0.96 | 0.29 |
| 6 | 31, 35 (21–42) | 28.7% | 0.31 (0.26–0.55) | 0.94 | 0.32 |
| 7 | 10, 9 (9–10) | 77.6% | 0.39 (0.36–0.43) | 0.91 | 0.41 |
| 8 | 10, 9 (9–10) | 78% | 0.39 (0.36–0.55) | 0.91 | 0.41 |
HRQOL, health-related quality of life. MCAT, multidimensional computerized adaptive testing. RMSD, root mean square difference. SE, standard error of measurement. 
, latent trait estimate. θ, true latent trait