The European Portuguese version of the ASAS Health Index for Patients with Spondyloarthritis: Measurement properties

• Main Authors: Santiago Rodrigues-Manica, Eduardo Cruz, Sofia Ramiro, Sandra Sousa, Renata Aguiar, Alexandre Sepriano, Pedro Machado, Jaime Branco, Uta Kiltz, Fernando Pimentel-Santos
• Format: Article
• Language: English
• Published: Sociedade Portuguesa de Reumatologia 2020-01-01
• Series: Acta Reumatológica Portuguesa
• Subjects: patient-reported outcome measure; patient reported outcomes; quality of life; spondyloarthritis
• Online Access: http://www.actareumatologica.pt/files/article/1284_the_european_portuguese_version_of_the_asas_health_index_for_patients_with_spondyloarthritis_measurement_properties_file.pdf

OBJECTIVE: The Assessments of SpondyloArthritis international Society Health Index (ASAS HI), estimates the impact of Spondyloarthritis (SpA) on global functioning and health. This article assesses the construct validity, reliability and responsiveness of the Portuguese version of the ASAS HI. PATIENTS AND METHODS: Patients fulfilling ASAS classification criteria for axial (axSpA) or peripheral SpA (pSpA) were included. Construct validity was assessed through Spearman’s correlation analysis with other health outcomes. Discriminant validity was tested comparing the ASAS HI across disease activity and functional states using the Kruskal–Wallis test. Internal consistency was assessed by Cronbach’s α, and test-retest reliability by intraclass correlation coefficients (ICC). Responsiveness was evaluated by the standardized response mean (SRM) in patients with active disease who required therapy escalation. RESULTS: Among the 91 patients included, 67% were male, mean (SD) age 47.2 (12.9) years, 63 patients with axSpA and 28 patients with pSpA. The hypothesis defined a priori to test construct validity were confirmed. The ASAS HI showed ability to discriminate between patients with different disease activity and functional states (p