Trauma Prevention Initiative - Data and Evaluation

TPI Reports and Background Information

• Program Highlights (2025)
• TPI Impact Report (2022)
• TPI Outcomes (2020)
• TPI Theory of Change - Intervention Strategy

TPI Community Outcome Indicators

Community outcome indicators, including trauma hospital visits and violent crime rates, are used to estimate impact of TPI strategies, using the year prior to implementation of each strategy as baseline. While TPI overall began in 2015, the Hospital Violence Intervention Program (HVIP) implementation started in July 2017, and the Street Outreach and Community Violence Intervention (SOCVI) Program in June-July 2018.

Trauma Hospital Visits

TPI receives annual data from the LA County Emergency Medical Services Agency that includes assault-related trauma hospital visits. Trauma visits include severe injuries that are transported to hospitals with a trauma center designation, where individuals receive specialized care for violence related injuries, including shootings, stabbings, and blunt force.

Between 2023 and 2024, TPI communities saw an 11.6% reduction in assault-related trauma hospital visit rates, compared to a 4.4% reduction in LA County overall.

Crime Trends

TPI receives monthly crime data from the Pomona Police Department (PPD) and downloads publicly available data from the Los Angeles County Sheriff’s Department. This includes Part I serious and violent crimes: aggravated assault, criminal homicide, forcible rape, and robbery.

Overall, among the nine TPI communities, violent crimes decreased by 6.7% between 2024 and 2025. During that same period, the Los Angeles Sheriff’s Department (LASD) reported a decrease of 5.5%.