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The discriminant ability of the ASAS-HI was assessed between groups differing in overall health -the four disease activity states according to the ASDAS score 8 (inactive, moderate, high and very high). All statistical tests were two-sided and p values ≤0.05 were considered significant. Statistical analyses was done using SPPS (Chicago, Illinois, USA) version 19.
RESULTS
Translation and cultural adaptation
No major problems for translation and cross-cultural adaptation were observed. Overall, none of the patients had difficulties in answering the ASAS-HI and they felt comfortable with evaluating the questionnaire. Results of the cognitive debriefing demonstrated that the translated version of the ASAS-HI was properly understood. The mean (SD) time to complete the ASAS-HI was 2.55 (0.9) minutes.
Clinimetric properties of the ASAS-HI
Subjects
Fifty patients agreed to participate and completed the questionnaire. The diagnosis was axSpA in 44 patients: AS (n=30) nr-axSpA (n=14) and pSpA in 6 patients. Of these patients, 18 participated in the test-retest reliability study arm and 10 participated in the sensitivity to change study arm. The characteristics of the population are presented in table 1. Fifty four percent of the patients were male, mean age of 44.8 (13.1) years and symptom duration of 15.8 (9.7) years. The mean scores for clinical assessments were: BASDAI 4.6 (2.2), BASFI 4.7 (2.5) and ASDAS-CRP 2.2 (1.0). The total score of the ASAS-HI was 8.2 (5.1).
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