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Table 4 Short form item properties (n = 13) in order of item difficulty
| Item | Measure | Model | Infit | Outfit | ||
|---|---|---|---|---|---|---|
| SE | MNSQ | ZSTD | MNSQ | ZSTD | ||
| Ventricle | 2.47 | 0.07 | 0.95 | −1.5 | 0.84 | −1.8 |
| Reflux | 1.32 | 0.07 | 0.88 | −4.6 | 0.86 | −2.7 |
| Gelling agent | 1.29 | 0.07 | 1.11 | 3.8 | 1.17 | 3.1 |
| Pessary | 0.73 | 0.07 | 0.95 | −1.8 | 0.88 | −2.4 |
| Malaise | 0.5 | 0.07 | 1.13 | 4.2 | 1.24 | 4.2 |
| Orthodontia | 0.44 | 0.07 | 1.09 | 2.7 | 1.18 | 3.2 |
| Chlamydia | 0.25 | 0.07 | 0.93 | −2 | 0.89 | −1.9 |
| Echography | 0.04 | 0.07 | 1.04 | 1.1 | 1.01 | 0.1 |
| Chiropractor | −0.44 | 0.08 | 1.1 | 2.3 | 1.29 | 3.3 |
| Biopsy | −1.36 | 0.1 | 0.91 | −1.4 | 0.78 | −1.7 |
| Plaque | −1.74 | 0.11 | 0.81 | −2.7 | 0.7 | −2 |
| Obesity | −1.75 | 0.11 | 0.94 | −0.7 | 0.9 | −0.6 |
| Flaking | −1.77 | 0.11 | 1.01 | 0.2 | 1.3 | 1.7 |
