Supplementary Material for: Prevalence of hidradenitis suppurativa in Poland

Introduction: Hidradenitis suppurativa (HS) is a chronic inflammatory skin condition characterized by recurrent boils or abscesses. Its prevalence varies globally, yet specific data from Poland are limited. This study aims to determine the prevalence of HS among adults in Poland, utilizing standardized methods as part of the Global Hidradenitis Suppurativa Atlas (GHiSA) initiative.
Methods: This monocenter study was conducted at internal medicine departments of University Hospital of Wroclaw. In the study, participants were individuals accompanying patients administered to the hospital, excluding individuals under 18 years of old, pregnant women, and those deemed incapable of participating. A self-administered screening questionnaire for HS diagnosis was utilized. Physical examinations and Hurley score assessments were conducted for participants reporting HS symptoms. In addition, approximately 10% of participants who did not report any HS symptoms were tested to determine the false-negative response rate. Statistical analysis was performed using R Project for Statistical Computing and Statistica 13.3 software.
Results: Out of 940 adults approached, 932 participated in the study. 21 participants reported HS symptoms, with 14 individuals diagnosed with HS upon examination. Additionally, 1 participant without reported symptoms was diagnosed with HS. The estimated prevalence of HS among the Polish adult population was 1.61% (95%CI 0.90–2.50%). The screening questionnaire exhibited a sensitivity and specificity of 93%, with a positive predictive value (PPV) of 67% and negative predictive value (NPV) of 99%.
Conclusion: This study shed some light on the prevalence of HS in Poland, indicating that it is a more common condition than previously reported in the literature. It can contribute to understanding the epidemiology of HS in Poland and may aid in improving diagnosis and management strategies for affected individuals.

引言：隐窝性痤疮（HS）是一种以反复发作的脓疱或囊肿为特征的慢性炎症性皮肤病。其全球流行率各异，然而来自波兰的具体数据有限。本研究旨在利用全球隐窝性痤疮图谱（GHiSA）倡议中的标准化方法，确定波兰成年人中HS的患病率。研究方法：这是一项在弗罗茨瓦夫大学医院内科部门进行的单中心研究。在研究中，参与者为陪同入院患者的个体，排除18岁以下未成年人、孕妇以及被认为无法参与研究的人员。使用了HS诊断的自填式筛查问卷。对报告HS症状的参与者进行了体格检查和Hurley评分评估。此外，对未报告任何HS症状的约10%参与者进行了检测，以确定假阴性反应率。统计分析使用R项目计算统计软件和Statistica 13.3软件进行。研究结果：在接触的940名成年人中，有932人参与了研究。21名参与者报告了HS症状，检查后诊断出14名HS患者。此外，1名未报告症状的参与者也被诊断出患有HS。波兰成年人口中HS的估计患病率为1.61%（95%CI 0.90–2.50%）。筛查问卷的敏感性、特异性分别为93%，阳性预测值（PPV）为67%，阴性预测值（NPV）为99%。结论：本研究对波兰HS的患病率进行了探讨，表明其患病率高于文献中先前报道的水平。这有助于理解波兰HS的流行病学，并可能有助于改善受影响个体的诊断和管理策略。