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Reilly MC, Zbrozek AS, Dukes EM. The validity and reproducibility of a work productivity and activity impairment instrument. PharmacoEconomics 1993; 4(5):353-65.
WPAI-GH Scoring
WPAI outcomes are expressed as impairment percentages, with higher numbers indicating greater impairment and less productivity, i.e., worse outcomes, as follows:
Questions:
1 = currently employed
2 = hours missed due to health problems
3 = hours missed non-health reasons
4 = hours actually worked
5 = degree health affected productivity while working
6 = degree health affected regular activities
Scores:
•Percent work time missed due to health: Q2/(Q2+Q4)
•Percent impairment while working due to health: Q5/10
•Percent overall work impairment due to health: Q2/(Q2+Q4)+[(1-Q2\(Q2+Q4))x(Q5/10)]
•Percent activity impairment due to health: Q6/10