Supplementary Material for: Prevalence of Hidradenitis Suppurativa in the Gulf Province of Papua New Guinea

Hidradenitis suppurativa (HS) is a chronic and debilitating inflammatory skin disease, which mostly occurs in the skinfolds. The global prevalence of HS is currently unknown. Depending on the type of research and studied population, the reported prevalence varies between 0.03% and 4.1%. It is important to investigate the prevalence of HS worldwide using the same study design, in order to recognize, diagnose, and treat patients in an earlier stage. Consequently, a worldwide initiative, the Global Hidradenitis Suppurative Atlas (GHiSA) has developed a study design to investigate the world-wide prevalence of HS in a comparable manner. The prevalence of HS in a Pacific Islander population has not been reported. The aim of this study was to estimate the prevalence of HS in Kapuna, Papua New Guinea.

We conducted an explorative, descriptive, cross-sectional mono center study in a secondary care center, the Kapuna hospital Papua New Guinea, to estimate the prevalence of HS in a Melanesian Pacific Islander population from Papua New Guinea. Participants were healthy persons accompanying patients who were admitted to Kapuna Hospital or attending its Outpatient Department, and healthy hospital staff. The primary outcome of this study was the point prevalence of HS in Papua New Guinea.

A total of 520 participants were included in this study. The prevalence of HS in these 520 participants was 0.38% (2/520, 95% confidence interval 0.1-1.4%).

The point prevalence of HS in Papua New Guinea was 0.38%. The findings of this study contribute to fill a gap in the current insights of the global HS prevalence.

化脓性汗腺炎（Hidradenitis suppurativa，HS）乃一种慢性且致残的炎症性皮肤病，主要发生于皮肤皱褶处。目前全球化脓性汗腺炎的患病率尚不明确。根据研究类型和研究对象的不同，报道的患病率介于0.03%至4.1%之间。采用统一的研究设计，全球范围内调查化脓性汗腺炎的患病率，对于早期识别、诊断和治疗患者具有重要意义。因此，全球化脓性汗腺炎图谱（Global Hidradenitis Suppurative Atlas，GHiSA）项目已制定了一项研究设计，旨在以可比的方式调查全球范围内化脓性汗腺炎的患病率。太平洋岛民群体中的化脓性汗腺炎患病率尚未有报道。本研究旨在评估巴布亚新几内亚卡普纳地区化脓性汗腺炎的患病率。我们于巴布亚新几内亚卡普纳医院——一家二级护理中心，开展了一项探索性、描述性、横断面、单中心研究，以估算来自巴布亚新几内亚的美拉尼西亚太平洋岛民群体中化脓性汗腺炎的患病率。参与者包括陪伴住院患者或前往卡普纳医院门诊部就诊的健康的陪同人员，以及医院工作人员。本研究的首要结局为巴布亚新几内亚化脓性汗腺炎的点患病率。本研究共纳入520名参与者。在520名参与者中，化脓性汗腺炎的患病率为0.38%（2/520，95%置信区间为0.1-1.4%）。巴布亚新几内亚的化脓性汗腺炎点患病率为0.38%。本研究的结果有助于填补当前全球化脓性汗腺炎患病率认识上的空白。