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）是一种慢性致残性炎症性皮肤病，多见于皮肤褶皱处。目前HS的全球患病率尚不明确，根据研究类型及研究人群的差异，报告的患病率介于0.03%至4.1%之间。为实现HS患者的早期识别、诊断与治疗，采用统一研究设计开展全球HS患病率调查至关重要。为此，一项名为全球化脓性汗腺炎图谱（Global Hidradenitis Suppurative Atlas, GHiSA）的全球倡议已制定标准化研究设计，旨在以可比方式调查HS的全球患病率。目前尚无太平洋岛民人群中HS患病率的相关报道，本研究旨在估算巴布亚新几内亚Kapuna地区的HS患病率。

我们在巴布亚新几内亚Kapuna医院（二级医疗机构）开展了一项探索性、描述性、单中心横断面研究，以估算巴布亚新几内亚美拉尼西亚太平洋岛民人群中的HS患病率。研究参与者包括入院患者的陪同人员及医院医护人员。本研究的主要结局指标为巴布亚新几内亚HS的时点患病率。

本研究共纳入520名参与者，HS患病率为0.38%（2/520，95%置信区间0.1%-1.4%）。

巴布亚新几内亚HS的时点患病率为0.38%，本研究结果有助于填补当前全球HS患病率认知的空白。