Operations and Information Management Department, The Wharton School, University of Pennsylvania, Philadelphia, PA 19104, USA.
Proc Natl Acad Sci U S A. 2011 Jun 28;108(26):10415-20. doi: 10.1073/pnas.1103170108. Epub 2011 Jun 13.
We evaluate the results of a field experiment designed to measure the effect of prompts to form implementation intentions on realized behavioral outcomes. The outcome of interest is influenza vaccination receipt at free on-site clinics offered by a large firm to its employees. All employees eligible for study participation received reminder mailings that listed the times and locations of the relevant vaccination clinics. Mailings to employees randomly assigned to the treatment conditions additionally included a prompt to write down either (i) the date the employee planned to be vaccinated or (ii) the date and time the employee planned to be vaccinated. Vaccination rates increased when these implementation intentions prompts were included in the mailing. The vaccination rate among control condition employees was 33.1%. Employees who received the prompt to write down just a date had a vaccination rate 1.5 percentage points higher than the control group, a difference that is not statistically significant. Employees who received the more specific prompt to write down both a date and a time had a 4.2 percentage point higher vaccination rate, a difference that is both statistically significant and of meaningful magnitude.
我们评估了一项现场实验的结果，该实验旨在衡量形成实施意向的提示对实现行为结果的影响。感兴趣的结果是在一家大公司为其员工提供的免费现场诊所接种流感疫苗。所有有资格参与研究的员工都收到了列出相关疫苗接种诊所时间和地点的提醒邮件。随机分配到治疗条件的员工的邮件还包括一个提示，要求他们写下（i）员工计划接种疫苗的日期或（ii）员工计划接种疫苗的日期和时间。当将这些实施意向提示包含在邮件中时，接种率会增加。对照组员工的接种率为 33.1%。收到只需写下日期提示的员工的接种率比对照组高 1.5 个百分点，这一差异没有统计学意义。收到更具体的提示，即同时写下日期和时间的员工的接种率高 4.2 个百分点，这一差异具有统计学意义且幅度较大。
