Morrisroe, K and Stevens, W and Huq, M and Sahhar, J and Ngian, G-S and Zochling, J and Roddy, J and Proudman, SM and Nikpour, M, and the Australian Scleroderma Interest Group (ASIG), Validity of the Workers Productivity and Activity Impairment Questionnaire: Specific Health Problem (WPAI:SHP) in patients with systemic sclerosis, Clinical and Experimental Rheumatology, 35, (Suppl 106) pp. S130-S137. ISSN 0392-856X (2017) [Refereed Article]
© Clinical and Experimental Rheumatology
Official URL: http://www.clinexprheumatol.org/abstract.asp?a=115...
Methods: SSc patients, identified through the Australian Scleroderma Cohort Study database, completed the WPAI:SHP and a quality of life instrument (PROMIS-29) cross-sectionally. The construct validity of the WPAI:SHP was assessed by the correlations between the WPAI:SHP and a range of SSc health states. Non-parametric correlation, including Spearman's correlation (ρ), was used to test the validity of WPAI:SHP and ability to distinguish between different health states.
Results: A total of 476 completed questionnaires was returned, equating to a response rate of 63.7%. Among those under 65 years of age, 155 patients (55.2%) were in paid employment. Employed patients had a mean (± SD) age of 56.5 (9.8) years and were predominantly female (87.3%) with limited disease subtype (75.6%). The WPAI:SHP showed construct validity based on moderate to strong correlations with health status as assessed by a range of health outcome measures including disease activity (ρ = 0.34-0.39, p = 0.001), physical function (ρ = 0.55-0.62, p = 0.001), disease severity (ρ = 0.55-0.62, p = 0.001), fatigue (ρ = 0.62-0.63, p = 0.001), pain (ρ = 0.68-0.71, p = 0.001), and breathlessness (ρ = 0.39-0.46, p = 0.001). Furthermore, according to the effect size, the WPAI:SHP scores have a large discriminative ability (d = 1.26-1.47) for distinguishing SSc patients with different health outcomes.
Conclusions: The WPAI is a valid questionnaire for assessing impairments in paid employment and social activities in SSc patients, and for measuring the relative differences between SSc patients with varying health states.
|Item Type:||Refereed Article|
|Keywords:||systemic sclerosis, workers productivity and activity impairment questionnaire, absenteeism, presenteeism|
|Research Division:||Biomedical and Clinical Sciences|
|Research Group:||Clinical sciences|
|Research Field:||Rheumatology and arthritis|
|Objective Group:||Clinical health|
|Objective Field:||Clinical health not elsewhere classified|
|UTAS Author:||Zochling, J (Dr Jane Zochling)|
|Deposited By:||Menzies Institute for Medical Research|
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