Work-related problems in multiple sclerosis: a literature review on its associates and determinants

Purpose: To explore which variables are associated to or determinants of work-related difficulties or unemployment in persons with multiple sclerosis (MS). Method: Papers published between 1993 and February 2015 were included. Quality was judged as poor, acceptable, good or excellent. Determinants were extracted from prospective and retrospective data, associated variables from cross-sectional data; variables were grouped by similarity. Evidence was judged as strong if there were at least two good studies reporting the same results; limited if there was only one good and some acceptable studies. Results: Forty-two papers were selected, for a total of 31192 patients (75% females). Work-related difficulties were referred as unemployment, lower amount of worked hours or job cessation. Strong evidence of impact over work-related difficulties was found for a core set of variables, i.e. expanded disability status scale, MS duration, patients’ age, fatigue and walking problems. Little evidence exists on the impact of contextual factors. Discussion: Most of the variables identified as associated to or determinants of work-related difficulties can be treated through rehabilitative interventions. It is important that future research addresses not only unemployment issues in MS, but also the amount and severity of problems affecting work-related tasks relying on specific assessment instruments.