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The dependent variables considerate, faithful, feminine, moral, self-respecting, and sincere were entered as single item trait measures.
The Item – Trait Interaction Statistic (denoted by the chi-square value), reflects the degree of invariance across the trait.
A statistically nonsignificant probability value (p>0.05; chi-square) of the item trait interaction score indicates model fit.
The 30 items in the PSOCQ did not fit the Rasch model Chi- square item trait statistics.
The items showed good fit at the individual level, although again the overall item trait interaction showed significant deviation from model expectations (χ2 = 119.160, df = 57, p = 0.000003).
(See Table 4; Fig 1) Then item 2 was split for age group; this resulted in excellent item fit and non-significant item trait interaction.
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Initial inspection of the scale showed poor overall fit to the Rasch model as evident in the standardised item Fit Residual statistic (mean = 0.039, SD = 3.14) and the item trait-interaction statistic (χ2 = 577.79, df = 160, p < 0.001).
In the latter case a chi-square fit statistic is available for each item, and the overall chi-square for items is summed to give the item trait-interaction statistic.
To measure emotional intelligence authors used the short version of 30-item Trait Emotional intelligence questionnaire.
Patients completed the 20-item trait scale of the state-trait anxiety inventory preoperatively.
In this study, the short 6-item state version and 10-item trait version of the STAI were used [ 19, 20].
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