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Rasch analysis confirmed that no item did not fit with the single factor, and identified that the item-difficulty parameters had moderate values. The convergent and criterion validity of the instrument were demonstrated, with diabetes knowledge and subjective diabetes numeracy, respectively, as was its acceptable internal consistency, by a Kuder-Richardson-20 coefficient of 0.81. CONCLUSIONS The DHNT demonstrated satisfactory psychometric properties. The instrument with moderate levels of item-difficulty may have a lower cognitive burd
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