Conversely, in the validation study of the English questionnaire [ 6 ] and in the preliminary evaluation of our questionnaire [ 12 ], older participants (≥65 years old) had higher scores in the PF domain ( P < 0.05), and younger participants (<65 years old) showed a trend of higher scores in the SEI domain; however, these data were not confirmed by our final results.
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Validation of the Italian version of the ANCA-associated vasculitis patient-reported outcome (AAV-PRO) questionnaire.
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