Item analysis using Rasch models confirms that the Danish versions of the DISABKIDS® chronic-generic and diabetes-specific modules are valid and reliable.

1 indicates that the latent independence variable contribute to responses to all items, that items CG2 and CG4 are locally independent while items CG1 and CG3 are locally dependent, and that age has a DIF effect on item CG5 in addition to an indirect effect mediated by independence. The over-all test-of-fit to the GLLMR indicates marginally significant results for lack of DIF with respect to HbA1c level, treatment, and age, but adjustment for multiple testing dismisses these results as unconvincing (Table 2B ).

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The model further suggested that item number six (“Are you able to do things without your parents?”) was problematic because there were highly significant differences between the observed and expected item-rest-score correlations (Table 3A ).

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