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The range for total item means is 1 6, with higher values indicating an increased stress experience.
Therefore, it is not problematic that there are different item values or totals across age groups.
The total score is calculated by summing item values, with a higher score indicating poorer compliance.
The total score is calculated by summing item values with higher scores indicting greater compliance problems [ 8].
Missing data: Cronbach's alpha can only be calculated for those without any missing item values and where total scores can be computed (see Tables 2 and 3).
All had Corrected Item total Correlation value above the cutoff point.
In the other dimensions there were only single items which had an item-total correlation value of less than 0.3.
The inclusion of the item that probed imitation, in factor one, must be interpreted in light of the lack of a significant group-wise difference for this item and the low correct item-total correlation value found (see Table 2).
The questionable α value for the PJ dimension is due to the fact that there were two items in the PJ dimension, PJ1 and PJ4, which had a low corrected item-total correlation value, respectively 0.226 and 0.276.
The "corrected items-total correlation" values for 7 items were <0.2 (not discriminating well) and therefore deleted, changing Cronbach's alpha from 0.84 to 0.85.
We removed items with item-total correlation values less than 0.2 and the reduced data set was re-modelled using PCA.
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