AimTo study the use of a quasi‐experimental design to assess the effects of scaling reimbursement policies on the incidence of chronic‐periodontitis procedures.Materials and MethodsInterrupted time series analysis was used to compare the effects before and after policy implementation using data on the number of periodontitis‐related procedures from the Korean National Health Insurance Service‐National Sample Cohort (n = 740,467) and the Health Screening Cohort (n = 337,904). Periodontitis‐related procedures with diagnosis codes were categorized into basic (scaling or root planing), intermediate (subgingival curettage) and advanced (tooth extraction, periodontal flap surgery, bone grafting for alveolar bone defects or guided tissue regeneration). Subjects' demographics and comorbidities were considered. The incidence rate of immediate changes and gradual effects before and after policy implementation was assessed.ResultsFollowing the policy implementation from July 2013, an immediate increase was observed in total and basic procedures. No significant changes were noted in intermediate and advanced procedures initially. A decrease in the slope of intermediate procedures was observed in both databases. Advanced procedures showed varied trends, with no change in the National Sample Cohort but an increase in the Health Screening Cohort, particularly among subjects with comorbidities.ConclusionsFollowing the new policy implementation, the number of intermediate procedures decreased while the number of advanced procedures increased, especially among patients with comorbidities. These findings offer valuable insights on policy evaluation.

中文翻译：

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韩国缩放报销政策前后慢性牙周炎相关手术的中断时间序列分析


目的研究使用准实验设计来评估扩大报销政策对慢性牙周炎手术发生率的影响。材料和方法使用来自韩国国民健康保险服务-国家样本队列 （n = 740,467） 和健康筛查队列 （n = 337,904） 的牙周炎相关手术数量数据，使用中断时间序列分析来比较政策实施前后的效果。具有诊断代码的牙周炎相关手术分为基本 （刮治或根面平整）、中级 （龈下刮除术） 和高级 （拔牙、牙周瓣手术、牙槽骨缺损的骨移植或引导组织再生）。考虑了受试者的人口统计学和合并症。评估了政策实施前后即时变化和渐进效应的发生率。结果自 2013 年 7 月政策实施以来，观察到总程序和基本程序立即增加。最初在中级和高级手术中没有发现显着变化。在两个数据库中都观察到中间程序的斜率降低。高级程序显示出不同的趋势，国家样本队列没有变化，但健康筛查队列增加，尤其是在患有合并症的受试者中。结论新政策实施后，中间手术数量减少，而高级手术数量增加，尤其是合并症患者。这些发现为政策评估提供了有价值的见解。