Supplementary Material for: Baseline Characteristics of a National French E-Cohort of Hidradenitis Suppurativa in ComPaRe and Comparison with Other Large Hidradenitis Suppurativa Cohorts

Background: Hidradenitis suppurativa (HS) is a chronic inflammatory skin condition substantially impacting patients’ quality of life; the pathogenesis remains unclear, and treatment is complex and not yet standardized. Observational data are increasingly being used to evaluate therapeutics in “real-life” interventions, and the development of e-cohorts is offering new tools for epidemiological studies at the population level. Objective: The aim of this study was to describe the clinical characteristics and treatment history of HS participants in the Community of Patients for Research (ComPaRe) cohort and to compare these to other cohorts. Methods: We performed a cross-sectional study of the baseline data of HS participants in ComPaRe, an e-cohort of patients with chronic diseases. Data were collected using patient-reported questionnaires about clinical-dem­ographic aspects, quality of life, and treatment history. Results: A total of 396 participants (339 females, 57 males) were included (mean age 38 years); 83 (21%) had a family history of HS, 227 (57.3%) were current smokers, and 241 (60.9%) were overweight or obese. Most of the participants declared a Hurley stage II (n = 263, 66.4%) or III (n = 76, 20.3%). The breast was more frequently affected in women than men (37.5 vs. 5.3%, p p p = 0.02) and some HS localizations (genital [p p p = 0.02], and groin [p n = 362, 91.4%), especially amoxicillin-clavulanic acid and cyclins. Less than 10% of participants received biologics. Most of these results were consistent with previously published cohorts. Conclusion: Recruitment of participants by such a web platform can be a faster way to get relevant scientific data for a wide variety of patients that could be used for epidemiological studies and to evaluate therapeutics in “real-life” interventions.