Despite advances to promote acceptance and equity in many countries, prejudice remains a significant social problem. Promoting intergroup harmony requires knowledge about what works to reduce prejudice in community settings. This meta-analysis of field experiments reveals the most effective intervention types and conditions for reducing negative attitudes towards minority groups in real-world settings. Across 69 intervention arms and 24,378 participants, results reveal that prejudice reduction interventions are effective at improving attitudes towards minority groups in real-world settings (d = 0.51, 95% CI [0.33; 0.68]). The prediction interval was −0.90 to 1.92. In this case, the prediction interval was particularly wide because of the high degree of heterogeneity detected in effect size. Subgroup analyses indicate that less commonly explored approaches, such as perceived variability, may have larger effect sizes than contact-based interventions. Still, more research is needed to confirm the effects of these less-researched approaches. Additionally, results show that interventions are more effective for school and college cohorts than for adults, and that the effects of prejudice reduction interventions endure over time.

中文翻译：

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是什么减少了现实世界中的偏见？减少偏见现场实验的荟萃分析

尽管许多国家在促进接受和公平方面取得了进展，但偏见仍然是一个重大的社会问题。促进群体间的和谐需要了解什么可以减少社区环境中的偏见。这种对现场实验的荟萃分析揭示了在现实世界中减少对少数群体的负面态度的最有效干预类型和条件。在 69 个干预组和 24,378 名参与者中，结果表明，减少偏见干预可有效改善现实世界环境中对少数群体的态度（d = 0.51, 95% CI [0.33; 0.68]）。预测区间为 -0.90 到 1.92。在这种情况下，预测区间特别宽，因为在效应大小中检测到高度异质性。亚组分析表明，较少探索的方法，例如感知变异性，可能比基于接触的干预具有更大的效果。尽管如此，仍需要更多的研究来证实这些研究较少的方法的效果。此外，结果表明，干预措施对学校和大学同龄人比对成年人更有效，并且减少偏见干预措施的效果会随着时间的推移而持续。