RT Journal Article
SR Electronic
T1 The Ankylosing Spondylitis Performance Index: Reliability and Feasibility of an Objective Test for Physical Functioning
JF The Journal of Rheumatology
JO J Rheumatol
FD The Journal of Rheumatology
SP 1475
OP 1482
DO 10.3899/jrheum.191063
VO 47
IS 10
A1 Rianne E. van Bentum
A1 Sebastian E. Ibáñez Vodnizza
A1 Maria P. Poblete de la Fuente
A1 Francisca Valenzuela Aldridge
A1 Victoria Navarro-Compán
A1 Tamara R. Rusman
A1 Marieke M. ter Wee
A1 Omar Valenzuela Letelier
A1 Salima F. E. van Weely
A1 Irene E. van der Horst-Bruinsma
YR 2020
UL http://www.jrheum.org/content/47/10/1475.abstract
AB Objective Physical function in patients with axial spondyloarthritis (axSpA) is currently evaluated through questionnaires. The Ankylosing Spondylitis Performance Index (ASPI) is a performance-based measure for physical functioning, which has been validated in Dutch patients with radiographic (r−) axSpA. The interrater reliability has not yet been determined. To our knowledge, this study is the first to evaluate the validity, reliability, and feasibility of the ASPI in another patient population, including both r− and nonradiographic (nr−) axSpA patients.Methods Patients with axSpA were recruited from rheumatology clinics in Santiago, Chile. Dutch instructions were translated to Spanish by a forward-backward procedure. Study visits were performed at baseline and 1–4 weeks later. Four ASPI observers were involved, measuring the performance times of the 3 ASPI tests. Validity was assessed through a patient questionnaire (numeric rating scale 0–10: ≥ 6 sufficient). For reliability, intraclass correlation coefficients (ICC) were calculated (with 95% CI). Correlations between the ASPI and disease variables were tested with regression analyses.Results Sixty-eight patients were included (57% male, 52% r-axSpA). All patients understood the Spanish instructions and considered the ASPI to reach its aim (84%) and representativeness (85%) for physical functioning. The overall interrater (n = 62) and test-retest (n = 39) reliability (ICC) of the 3 tests combined were 0.93 (0.88–0.96) and 0.94 (0.87–0.97), respectively. Eighty-two percent of the patients completed all tests and 94% finished in < 15 min (feasibility).Conclusion This study demonstrated a high validity and feasibility in an entirely different population, with both r-axSpA and nr-axSpA. The interrater and test-retest reliability was excellent. The ASPI instructions are now available for Spanish-speaking patients.