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A Validity Analysis of the Work Productivity Short Inventory (WPSI) Instrument Measuring Employee Health and Productivity

Ozminkowski, Ronald J. PhD; Goetzel, Ron Z. PhD; Long, Stacey R. MS

Journal of Occupational and Environmental Medicine: November 2003 - Volume 45 - Issue 11 - p 1183-1195
doi: 10.1097/01.jom.0000091694.62216.64
ORIGINAL ARTICLES
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The Work Productivity Short Inventory (WPSI) was developed to quickly estimate decrements in productivity associated with 15 common disease conditions. Three versions of the WPSI were developed that differed according to the length of the recall period (12 months, 3 months, or 2 weeks). The content, predictive, and construct validity of metrics generated from the WPSI were assessed based on response patterns found in the 3 versions and via comparison to information in national data sources or in the subject company’s medical care claims and short-term disability program files. The WPSI provided evidence of content and construct validity to support its intended purpose. Evidence for predictive validity was weaker but still present. The WPSI can be used to provide information on the relative importance of health conditions that affect productivity at work for a large group of employees.

From the Health and Productivity Management Research (Dr Ozminkowski), Medstat, Ann Arbor, Michigan; the

Address correspondence to: Ronald J. Ozminkowski, PhD, Medstat, 777 East Eisenhower Parkway, 804B, Ann Arbor, MI 48108; E-mail address: ron.ozminkowski@medstat. com.

Institute for Health and Productivity Management (Dr Goetzel), Cornell University; Consulting and Applied Research (Dr Goetzel), Medstat, Washington, DC; and Outcomes Research and Econometrics (Ms Long), Medstat, Washington, DC.

©2003The American College of Occupational and Environmental Medicine