Background Adequate on-site first aid delivery at mass gatherings (MGs) is one of the cornerstones to ensure safe and healthy MGs. We investigated medical usage rates, frequency of triage categories and type of injury or medical complaint, among attendees at MGs in Belgium. Methods We analysed the Medical Triage and Registration Informatics System database, which includes prospectively collected person-level data regarding individuals visiting on-site posts at MGs in Belgium. MGs attended by >10 000 people and organised ≥5 times between 2009 and 2018 were included. We determined the proportion of patients in each triage category (‘first aid’ vs ‘medical condition’ vs ‘medical emergency’ vs ‘no treatment’) and each type of injury or medical complaint, and we calculated patient presentation rate (PPR) and transfer to hospital rate (TTHR). Results Twenty-eight MGs, totalling 194 events, were included involving 148 265 patient visits. ‘First aid’ was the most common triage category (80%, n=118 514). The need for a nurse/physician (‘medical condition’), and for the treatment of life-threatening conditions (‘medical emergency’) was rare (8.9%, n=13 052, and 0.6%, n=860, of all patient presentations, respectively), but remarkably higher during indoor electronic dance music (EDM) events (17.8% (n=26 391) and 4.0% (n=5930), of all patient presentations, respectively). ‘Skin wounds’ were the most common injury category (42.4%, n=62 275). ‘Respiratory problems’, ‘neurological problems’, ‘intoxication’, ‘heart complaints’ and ‘gastrointestinal complaints’ were more frequent during indoor (electronic) dance, whereas ‘burns’, ‘fracture/contusion’ and ‘skin wounds’ were higher during outdoor music, sports events and city festivals, respectively. PPR (per 10 000 attendees) was highest for outdoor EDM and outdoor music (median 130 (IQR 79) and 129 (IQR 104), respectively). TTHR (per 10 000 attendees) was highest for indoor EDM (median 4.4 (IQR 8.5)). Conclusion Medical usage rates, proportion of patients in triage and injury or medical complaint categories varied across different MG categories, suggesting opportunities for planning medical coverage at these events.

中文翻译：

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群众集会事件：对分类类别、伤害或医疗投诉类型和医疗使用率的回顾性分析

背景 在大规模集会 (MG) 中提供充分的现场急救是确保 MG 安全和健康的基石之一。我们调查了比利时 MG 参加者的医疗使用率、分诊类别的频率以及受伤或医疗投诉的类型。方法 我们分析了医疗分诊和注册信息系统数据库，其中包括前瞻性收集的有关访问比利时 MG 现场职位的个人的个人数据。包括 2009 年至 2018 年间参加人数超过 10 000 人且组织 ≥5 次的 MG。我们确定了每个分诊类别（“急救”与“医疗状况”与“医疗紧急情况”与“未治疗”）和每种伤害或医疗投诉的患者比例，并计算了患者就诊率 (PPR) 和转入医院率 (TTHR)。结果共纳入 28 个 MG，共 194 个事件，涉及 148 265 次患者就诊。“急救”是最常见的分类类别（80%，n=118 514）。很少需要护士/医生（“医疗状况”）和治疗危及生命的状况（“医疗紧急情况”）（8.9%，n=13 052 和 0.6%，n=860）患者陈述），但在室内电子舞曲 (EDM) 活动期间显着增加（分别占所有患者陈述的 17.8% (n=26 391) 和 4.0% (n=5930)）。“皮肤伤口”是最常见的损伤类别（42.4%，n=62275）。“呼吸问题”、“神经问题”、“中毒”、“心脏问题”和“胃肠道问题”在室内（电子）舞蹈中更为常见，而“烧伤”、在户外音乐、体育赛事和城市节日期间，“骨折/挫伤”和“皮肤伤口”分别较高。户外 EDM 和户外音乐的 PPR（每 10 000 名与会者）最高（中位数分别为 130 (IQR 79) 和 129 (IQR 104)）。TTHR（每 10 000 名与会者）在室内 EDM 中最高（中位数 4.4 (IQR 8.5)）。结论 医疗使用率、分诊和受伤或医疗投诉类别的患者比例在不同的 MG 类别中有所不同，这表明在这些事件中规划医疗保险的机会。