一场毫无意义的抽奖。
A useless raffle.
作者信息
Mortagy A K, Howell J B, Waters W E
出版信息
J Epidemiol Community Health. 1985 Jun;39(2):183-4. doi: 10.1136/jech.39.2.183.
Abstract
A mailed questionnaire was sent to 2712 subjects asking about respiratory symptoms, and a raffle for three prizes of 50 pounds, 30 pounds, and 20 pounds was organised. The response rate in the 1762 who were told about the raffle was no higher than for 950 subjects who served as controls.
摘要
向2712名受试者发送了一份关于呼吸症状的邮寄调查问卷，并组织了一场抽奖活动，奖品为三个分别价值50英镑、30英镑和20英镑的奖项。被告知抽奖活动的1762名受试者的回复率并不高于作为对照组的950名受试者。
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