Background: Work Ability Score (WAS) is a common instrument for assessing work ability but its validity in assessing presenteeism and productivity loss is unknown.
Aims: To validate a WAS-based measure, the Presenteeism Scale (PS), and to evaluate its accuracy as a presenteeism instrument among forestry employees.
Methods: This validation study was based on questions of perceived WAS assessed using the Work Ability-Personal Radar (WA-PR) instrument and on questions of perceived productivity loss and presenteeism assessed using a cross-sectional questionnaire survey.