Validity and reliability of Work Productivity and Activity Impairment among patients with axial spondyloarthritis in Singapore.
Jie Kie PhangElenore Judy B UyWeng Seng Warren FongChuen Seng TanNai Lee LuiJulian ThumbooYing Ying LeungPublished in: International journal of rheumatic diseases (2020)
This study supports the content validity, construct validity, and test-retest reliability of the WPAI in patients with axSpA.