J Phys Act Health. 2020 May 11;17(6):641-649. doi: 10.1123/jpah.2019-0313.
Social comparison feedback is often used in physical activity interventions but the optimal design of feedback is unknown.
This 4-arm, randomized trial consisted of a 13-week intervention period and 13-week follow-up period. During the intervention, 4-person teams were entered into a weekly lottery valued at about $1.40/day and contingent on the team averaging ≥7000 steps per day. Social comparison feedback on performance was delivered weekly for 26 weeks, and varied by reference point (50th vs 75th percentile) and forgiveness in use of activity data (all 7 d or best 5 of 7 d). The primary outcome was the mean proportion of participant-days achieving the 7000-step goal.
During the intervention period, the unadjusted mean proportion of participant-days that the goal was achieved was 0.47 (95% confidence interval [CI]: 0.38 to 0.56) in the 50th percentile arm, 0.38 (95% CI: 0.30 to 0.37) in the 75th percentile arm, 0.40 (95% CI: 0.31 to 0.49) in the 50th percentile with forgiveness arm, and 0.47 (95% CI: 0.38 to 0.55) in the 75th percentile with forgiveness arm. In adjusted models during the intervention and follow-up periods, there were no significant differences between arms.
Changing social comparison feedback did not impact physical activity.
社会比较反馈常用于体育活动干预，但最佳反馈设计尚不清楚。
这是一项 4 臂随机试验，包括 13 周的干预期和 13 周的随访期。在干预期间，4 人一组参加每周一次的抽奖，奖金约为每天 1.40 美元，前提是团队平均每天的步数达到 7000 步以上。每周为参与者提供 26 周的社会比较反馈，反馈内容因参考点（第 50 百分位数与第 75 百分位数）和活动数据使用的宽容度（所有 7 天或最佳 5 天中的 7 天）而异。主要结局是达到 7000 步目标的参与者天数的平均比例。
在干预期间，未经调整的目标达成参与者天数的比例在第 50 百分位数组为 0.47（95%置信区间：0.38 至 0.56），第 75 百分位数组为 0.38（95%置信区间：0.30 至 0.37），第 50 百分位带有宽容度的组为 0.40（95%置信区间：0.31 至 0.49），第 75 百分位带有宽容度的组为 0.47（95%置信区间：0.38 至 0.55）。在干预和随访期间的调整模型中，各臂之间没有显著差异。
改变社会比较反馈并没有影响身体活动。
