Assessing the effects of the Group Violence Intervention on firearm violence in Philadelphia

IF 1.8 2区社会学 Q2 CRIMINOLOGY & PENOLOGY Journal of Experimental Criminology Pub Date : 2023-12-22 DOI:10.1007/s11292-023-09601-w

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Abstract

Objectives

This study assesses the effects of a Group Violence Intervention (GVI) implementation in Philadelphia on group member-involved (GMI) firearm violence. Because the implementation began in August 2020 during the COVID-19 pandemic, public health restrictions necessitated relying on individualized Mobile Call-In Team (MCIT) custom notifications, rather than large-scale call-in meetings, as the primary implementation method.

Methods

During the January 2020–May 2022 study period, not all at-risk group-units received GVI treatment at the same time. Likewise, not all census tracts received GVI treatment at the same time. Given this variation in treatment initiation, a quasi-experimental stepped wedge design assessed the effect of GVI treatment on GMI shootings on the dimensions of both group and place. Estimates were calculated using Poisson regression. The effects of treatment dosage were also assessed.

Results

A group-unit, post-treatment relative to pre-treatment, experienced, on average, a significant 38.6% reduction in shootings per week. Where a census tract received between 4 and 7 doses relative to 0 doses (pre-treatment), there was a significant 51.0% reduction in GMI shootings per week.

Conclusions

A GVI implementation through custom notifications appears to maintain the effectiveness of GVI. Future research should assess the role of GVI components, including both enforcement actions and social services, as mechanisms for GVI effectiveness in a custom notification-based implementation.

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评估群体暴力干预措施对费城枪支暴力的影响

摘要目的本研究评估了在费城实施的团体暴力干预（GVI）对团体成员参与的枪支暴力的影响。由于该计划于 2020 年 8 月 COVID-19 大流行期间开始实施，公共卫生方面的限制使得该计划的主要实施方法必须依赖于个性化的移动召集小组（MCIT）定制通知，而不是大规模的召集会议。方法在 2020 年 1 月至 2022 年 5 月的研究期间，并非所有高危群体单位都在同一时间接受了 GVI 治疗。同样，并非所有人口普查区都在同一时间接受了 GVI 治疗。鉴于治疗启动方面的这种差异，我们采用了一种准实验性的阶梯式楔形设计，从群体和地点两个维度来评估 GVI 治疗对 GMI 枪击事件的影响。估计值采用泊松回归法计算。此外，还评估了治疗剂量的影响。结果群体单位在治疗后与治疗前相比，每周枪击事件平均大幅减少 38.6%。相对于 0 剂量（治疗前），如果一个普查区接受了 4 至 7 个剂量，则每周的 GMI 枪击事件大幅减少 51.0%。结论通过自定义通知实施 GVI 似乎能够保持 GVI 的有效性。未来的研究应评估 GVI 各组成部分（包括执法行动和社会服务）在基于自定义通知的实施过程中作为 GVI 有效性机制的作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Experimental Criminology CRIMINOLOGY & PENOLOGY-

CiteScore

6.20

自引率

6.70%

发文量

期刊介绍： The Journal of Experimental Criminology focuses on high quality experimental and quasi-experimental research in the advancement of criminological theory and/or the development of evidence based crime and justice policy. The journal is also committed to the advancement of the science of systematic reviews and experimental methods in criminology and criminal justice. The journal seeks empirical papers on experimental and quasi-experimental studies, systematic reviews on substantive criminological and criminal justice issues, and methodological papers on experimentation and systematic review. The journal encourages submissions from scholars in the broad array of scientific disciplines that are concerned with criminology as well as crime and justice problems.