Disutility in Patients with Hidradenitis Suppurativa: A Cross-sectional Study Using EuroQoL-5D.

Disutility reflects the disability caused by a disease. The EuroQoL-5D (EQ-5D) questionnaire is a measure of health-related overall utility. The questionnaire has only been applied previously to a small number of patients with hidradenitis. In this study a survey of 421 patients with hidradenitis suppurativa was conducted using the EQ-5D questionnaire. Questions regarding pain, malodour and pruritus were included to determine quantitatively whether these factors are associated with low EQ-5D index and visual analogue scale (VAS) scores. The index and VAS scores obtained were compared with reference values for the general population in Denmark. A significantly decreased utility in patients with hidradenitis suppurativa was found for all age group levels, except for 65-74-year-olds. The total index score in the cohort was 0.705 (population mean 0.887) and the VAS was 62.25 (population mean 82.6). Multivariate analysis found significant associations between loss of utility and pain, malodour and pruritus (p < 0.0001). Patients with hidradenitis suppurativa had a significantly decreased EQ-5D compared with the background population. Malodour and pruritus were found to be associated with low index values, and pain and malodour with low VAS. Patient-reported pain and discomfort had the most negative overall effect on mean index scores.