Adherence and persistence to drug therapies for multiple sclerosis: A population-based study.

•Adherence and persistence were examined in a large population-based MS cohort.•Optimal adherence was observed in 76% of patients.•Adherence was higher than previously reported results from other chronic diseases.•Adherence was higher than previously reported in non-population-based MS cohorts.•Sociodemographic factors were not consistently associated with adherence.