Validity and Responsiveness of the Work Functioning Impairment Scale in Workers With Depression

Area of Science:

• Psychiatry
• Occupational Health
• Clinical Psychology

Background:

• Depression is a leading cause of presenteeism, impacting workforce productivity.
• Assessing work functioning in depressed individuals is crucial for effective treatment and management.
• The Work Functioning Impairment Scale (WFun) is a potential tool for evaluating this aspect.

Purpose of the Study:

• To evaluate the convergent validity of the WFun scale.
• To assess the responsiveness of the WFun scale in patients with depression.
• To determine the utility of WFun in clinical settings for working psychiatric outpatients.

Main Methods:

• The study included 37 working outpatients diagnosed with major depression or bipolar disorder.
• Baseline assessments utilized the WFun, Quick Inventory of Depressive Symptomatology (QIDS), Hamilton Depression Rating Scale (HAM-D), and Montgomery-Asberg Depression Rating Scale (MADRS).
• Responsiveness was evaluated by tracking WFun and QIDS scores over time.

Main Results:

• Regression analyses revealed significant positive correlations between baseline WFun scores and HAM-D/MADRS scores.
• Changes in WFun scores were positively correlated with changes in QIDS scores, indicating responsiveness.
• These findings support the WFun scale's ability to capture depression-related work impairment.

Conclusions:

• The WFun scale demonstrates convergent validity, correlating well with established depression severity measures.
• The WFun scale is responsive to changes in depressive symptoms over time.
• WFun is a valid and reliable instrument for assessing depression severity and its impact on work functioning in psychiatric outpatients.