Explaining variations in general practitioners’ experiences of doing medically based assessments of work ability in disability benefit claims. A survey-based analysis

Purpose: Assessing patients’ work ability is a task that many general practitioners consider challenging. Increase of mental and musculoskeletal disorders further complicate the assessments. The purpose of this paper is to explain variation between general practitioners related to how they experience the assessment of work ability in disability cases. Methods: Combining data from an original postal survey among all general practitioners in Norway (N = 1,466; response rate = 32.5%) with characteristics of the municipality where they work, we use multilevel logistic regression to estimate the relationship between a set of dependent variables measuring how confident general practitioners feel when assessing patients’ work ability in disability cases, physician-related characteristics and structural factors. Results: A main finding is that length of service explains most of the variation between general practitioners (B = 0.492 [0.015, 0.970]–2.127 [1.457, 2.798]); in most of the regressions, this variable turns out as positive and significant (p