Harris Ian A, Khoo Oliver K, Young Jane M, Solomon Michael J, Rae Hamish
Department of Orthopaedics,Liverpool Hospital, Elizabeth Street, Liverpool, NSW 2170, Australia.
J Clin Epidemiol. 2008 Jun;61(6):609-10. doi: 10.1016/j.jclinepi.2007.07.012. Epub 2008 Feb 14.
Our study aimed to examine the effect of an instant lottery ticket incentive on the response rate to a mailed questionnaire in a population of trauma patients.
A randomized controlled trial at a major trauma center with 728 patients randomized into 2 groups prior to mailing of a questionnaire. One group of patients (Group A) had a sentence inserted into the cover letter stating that they would receive a $4 instant lottery ticket upon receipt of a completed questionnaire; Group B did not have an incentive. The response rate for both groups was measured after the initial mailing and at the end of the study. The results were analyzed using the X2 test to compare 2 proportions and a P value of .05 was considered significant.
The early response rate in Group A was lower than in Group B, and the response rates for both groups were similar at final follow-up. The differences at both time periods were not statistically significant.
The use of an instant lottery ticket incentive did not improve the response rate to a mailed questionnaire.
我们的研究旨在探讨即时彩票激励对创伤患者群体中邮寄问卷回复率的影响。
在一家大型创伤中心进行的一项随机对照试验，在邮寄问卷前将728例患者随机分为2组。一组患者（A组）在附信中插入一句话，表明他们在收到填好的问卷后将获得一张4美元的即时彩票；B组没有激励措施。在初次邮寄后和研究结束时测量两组的回复率。使用X2检验分析结果以比较两个比例，P值为0.05被认为具有统计学意义。
A组的早期回复率低于B组，在最终随访时两组的回复率相似。两个时间段的差异均无统计学意义。
使用即时彩票激励并未提高邮寄问卷的回复率。
