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Lost productivity as measured by the Work Productivity and Activity Impairment questionnaire (WPAI) [22]. A) Percent time lost in the past week (unadjusted). B) Adjusted rate ratios for work and activity impairment among workers workers by self-rated OA severity relative to workers without OA. *p < 0.001 and †p < 0.0001 relative to workers without OA.
