Differences within ordered-category answer patterns for question M (“What is your personal opinion on baclofen’s efficacy, by comparison with approved treatments?”).

Comparisons between the 5 ordered-category answers were made using Fisher exact tests for categorical variables and Kruskall-Wallis tests for quantitative variables. Differences in the response patterns to question A (ordered-categories defining the number of patients treated) within the 5 possible answers to question M were analysed by considering ordered-category answers to question A as a discrete continuous variable (from 1 to 4), and then using a Kruskall-Wallis test. By considering response patterns to both questions A and M as discrete continuous variables, we also calculated a Spearman’s correlation coefficient between these two variables (ρ = −0.41, p<10E-4), indicating that the more the prescribers treated patients with baclofen, the more they deemed that this drug was more efficacious than approved medications.