Bystander interventions are recognized as “promising” programming to reduce sexual violence. Gaps in current evaluations include limited follow-up post-training (beyond 24 months) and knowledge of additional bystander training during follow-up.

In this prospective cohort study, nested in a cluster randomized controlled trial (RCT), three cohorts of high school (HS) seniors were recruited (Fall 2013-2015) and followed through Spring 2018 (n = 1,831). Training was based on their school cluster RCT assignment and receipt of additional Green Dot (GD) training after HS. Training was hypothesized to be associated with lower scores indicating less acceptance of violence or sexism.

Sixty percent reported GD training after HS (68.7% of 986 in intervention and 50% of 845 in control conditions). No significant differences (p < .05) were observed by GD training for four of the five violence acceptance or sexism attitudinal measures at recruitment or final surveys. For “ambivalent sexism” alone was there a significant reduction in scale scores over time in the intervention versus control condition. Additional GD training after the RCT significantly reduced neither violence acceptance nor sexism scores over time.

GD training does not appear to have a consistent longer-term impact on reducing violence acceptance and sexism.

旁观者干预被认为是减少性暴力的“有希望的”计划。当前评估中的差距包括有限的后续培训后（超过 24 个月）和后续过程中额外旁观者培训的知识。

在这项嵌套在集群随机对照试验 (RCT) 中的前瞻性队列研究中，招募了三组高中 (HS) 高年级学生（2013 年至 2015 年秋季）并跟踪到 2018 年春季（n = 1,831）。培训基于他们的学校集群 RCT 分配和 HS 后接受额外的绿点 (GD) 培训。假设培训与较低的分数相关，表明对暴力或性别歧视的接受程度较低。

60% 的人报告了 HS 后的 GD 训练（986 人中的 68.7% 处于干预状态，50% 的 845 人处于控制状态）。GD 培训在招募或最终调查时对五项暴力接受或性别歧视态度测量中的四项未观察到显着差异 ( p < .05)。仅就“矛盾的性别歧视”而言，干预与控制条件下的量表分数随着时间的推移而显着降低。RCT 后额外的 GD 培训随着时间的推移，既没有显着降低暴力接受程度，也没有显着降低性别歧视分数。

GD 培训似乎对减少暴力接受和性别歧视没有一致的长期影响。