‡ Ordinal standardised item Cronbach alpha.
Internal consistency was calculated by Cronbach's standardised item alpha.
The same conclusion was reached when we employed the ordinal standardised item alpha coefficient (Table 4).
Alpha = 0.78 Standardised item Alpha = 0.79 Criterion validity was assessed by using a single-item assessment of perceived treatment need (Table 2).
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).
All the RMSEA, CFI and TLI for the seven-syndrome CBCL structure reached acceptable fit levels, except aggressive behaviours which were slightly below the cut-off (Table 2).> -wrap-foot>> Standarditem item loading computed with confirmatory factor analysis implemented with structural equation modelling.
Standardised item alpha = 0.79 Regarding criterion validity, the results indicated that adults who perceived a need for dental treatment had much higher OIDP scores than those who did not perceive dental treatment need (p < 0.001) (Table 5).
Due to the ordinal nature of the data, an ordinal standardised item alpha coefficient was also derived by inserting polychoric correlations into the simplified formula of the alpha coefficient [ 46, 47].
Standardised item Alpha = 0.71 Alpha = 0.69 Regarding the criterion validity (Table 5), individuals who perceived need for dental treatment had much higher OIDP and lower OSS in comparison to those that did not (p < 0.001).
Note: All reliability coefficients represent standardised item alpha a 4 items in scale; b 5 items in scale; c 3 items in scale Following Geer [ 44], the participants were asked to indicate how much anxiety or fear they felt towards the different animals.
