Department of Finance and Business Economics, University of Southern California, Los Angeles, CA 90089.
Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089.
Proc Natl Acad Sci U S A. 2023 Aug;120(31):e2302725120. doi: 10.1073/pnas.2302725120. Epub 2023 Jul 24.
Despite substantially decreasing the risk of hospitalization and death from COVID-19, COVID-19 booster vaccination rates remain low around the world. A key question for public health agencies is how to increase booster vaccination rates, particularly among high-risk groups. We conducted a large preregistered randomized controlled trial (with 57,893 study subjects) in a county health system in northern California to test the impact of personal reminder messages and small financial incentives of $25 on booster vaccination rates. We found that reminders increased booster vaccination rates within 2 wk by 0.86 percentage points ( = 0.000) or nearly 33% off the control mean of 2.65%. Monetary incentives had no additional impact on vaccination rates. The results highlight the potential of low-cost targeted messages, but not small financial incentives, to increase booster vaccination rates.
尽管 COVID-19 加强针疫苗接种大大降低了因 COVID-19 住院和死亡的风险，但全球 COVID-19 加强针疫苗接种率仍然很低。公共卫生机构的一个关键问题是如何提高加强针疫苗接种率，特别是在高风险人群中。我们在加利福尼亚州北部的一个县卫生系统中进行了一项大规模的预先注册的随机对照试验（涉及 57893 名研究对象），以测试个人提醒信息和 25 美元小额经济激励对加强针疫苗接种率的影响。我们发现，提醒在 2 周内将加强针疫苗接种率提高了 0.86 个百分点（ = 0.000），比对照组的 2.65%的平均水平高出近 33%。经济激励对疫苗接种率没有额外的影响。研究结果强调了低成本有针对性的信息的潜力，但小额经济激励并没有增加加强针疫苗接种率。
