Background: Work-related problems are a serious concern among persons with substance use but due to lack of a standardized tool to measure it; these problems are neither systematically assessed nor appropriately addressed. Most existing measures of work performance cater to the needs of the workplace rather than focusing on the workers' perception of the difficulties at work.
Aim: To develop a standardized instrument to measure work-related problems in persons with substance use disorders.
Methods: Qualitative data obtained from interviews with substance users were used to develop a scale. The refined list of the scale was circulated among an expert panel for content validation. The modified scale was administered to 150 cases, and 50 cases completed the scale twice at the interval of 2 weeks for test-retest reliability.
Results: Items with a test-retest reliability kappa coefficient of 0.4 or greater were retained and subjected to factor analysis. The final 45-item scale has a five-factor structure. The value of Cronbach's alpha of the final version of the scale was 0.91.
Conclusions: This self-report questionnaire, which can be completed in 10 min, may help us in making a baseline assessment of the work-related impairment among persons with substance use and the impact of substance use on work.
Keywords: Occupation; substance use; vocational difficulties; work-related problems.