Table 3 Summary statistics for all analyses
| Â | Unidimensionality | Item location | Person location | Item fit residual | Person fit residual | Item Trait Interaction | PSI |
|---|---|---|---|---|---|---|---|
9 item PD-Q (original) | p = 0.065 95%CI 0.048–0.082 | Z = 0.00 SD = 0.37 | Z = 0.14 SD = 0.69 | Z = 0.77 SD = 3.65** | Z = -0.28 SD = 1.26** | χ 2 (27) = 104.8 p <0.000** | 0.77 |
7 item PD-Q | p = 0.028 95%CI 0.011–0.045 | Z = 0.00 SD = 0.34 | Z = -0.11 SD = 0.99 | Z = 0.36 SD = 3.39** | Z = -0.39 SD = 1.20** | χ2 (10) = 16.78, p = 0.079 | 0.79 |