Table 3.
GRM item parameter estimate and fit statistics for 29 of OHI.
| Items content | a | b1 | b2 | b3 | S-X2 |
|---|---|---|---|---|---|
| Q1 | 1.724 | -1.260 | 0.885 | 2.73 | 70.511 |
| Q2 | 1.43 | -1.887 | 0.341 | 1.491 | 73.791 |
| Q3 | 1.862 | -2.738 | -0.243 | 2.25 | 47.594 |
| Q4 | 1.498 | -1.687 | 0.228 | 2.446 | 49.494 |
| Q5 | 2.436 | -0.896 | 0.993 | 2.239 | 48.539 |
| Q6 | 1.992 | -0.7 | 0.917 | 2.189 | 50.641 |
| Q7 | 1.846 | -2.805 | -0.78 | 2.198 | 41.504 |
| Q8 | 2.24 | -1.331 | 0.446 | 1.325 | 66.185 |
| Q9 | 0.995 | -3.176 | 0.126 | 3.108 | 60.153 |
| Q10 | 1.11 | -1.355 | 0.701 | 3.108 | 83.775 |
| Q11 | 1.05 | -1.027 | 1.186 | 2.576 | 98.627 |
| Q12 | 0.953 | -1.513 | 0.257 | 3.793 | 64.521 |
| Q13 | 1.687 | -1.978 | 0.424 | 2.393 | 56.818 |
| Q14 | 1.73 | -2.525 | -0.504 | 1.941 | 38.113 |
| Q15 | 1.353 | -1.798 | 0.316 | 1.878 | 86.021 |
| Q16 | 1.525 | -2.26 | 0.164 | 1.702 | 52.78 |
| Q17 | 1.087 | -2.155 | 0.578 | 2.382 | 71.709 |
| Q18 | 1.272 | -1.737 | -0.022 | 3.102 | 75.179 |
| Q19 | 2.143 | -2.404 | 0.146 | 2.097 | 30.131 |
| Q20 | 1.87 | -0.943 | 0.608 | 2.686 | 59.746 |
| Q21 | 1.452 | -1.02 | 0.956 | 2.961 | 88.409∗ |
| Q22 | 1.285 | -3.056 | -0.744 | 1.682 | 65.058 |
| Q23 | 1.348 | -2.971 | -0.557 | 2.365 | 62.571 |
| Q24 | 1.928 | -2.212 | 0.16 | 1.471 | 62.383 |
| Q25 | 1.356 | -2.567 | -0.625 | 1.584 | 69.014 |
| Q26 | 1.714 | -1.694 | 0.345 | 2.262 | 53.011 |
| Q27 | 1.153 | -3.176 | -0.517 | 2.332 | 52.344 |
| Q28 | 1.236 | -2.165 | 0.229 | 2.465 | 85.217 |
| Q29 | 1.862 | -2.628 | 0.17 | 1.865 | 46.971 |
Notes: ∗p value ≤0.05, a: item discrimination; b: item difficulty threshold; and S-X2: item fit values.