在一项流行病学研究中使用卡片背面系统联系患者所产生的偏差。
Bias resulting from using the card-back system to contact patients in an epidemiologic study.
作者信息
McTiernan A, Weiss N S, Daling J R
出版信息
Am J Public Health. 1986 Jan;76(1):71-3. doi: 10.2105/ajph.76.1.71.
In a case-control study of thyroid cancer in women in western Washington, the card-back system was used to contact patients. Demographic characteristics and reproductive history of 124 cases who returned a card and 35 who did not were compared, and were found to differ with respect to various reproductive and demographic factors. Relative risk estimates for various thyroid cancer risk factors were calculated two ways: including as cases only those who returned a card, and including all cases; these estimates differed for some risk factors. The results suggest that the use of the card-back system may result in a low level of response which can lead to biased study results.
在一项针对华盛顿州西部女性甲状腺癌的病例对照研究中，采用了明信片反馈系统来联系患者。对寄回明信片的124例患者和未寄回的35例患者的人口统计学特征及生殖史进行了比较，发现他们在各种生殖和人口统计学因素方面存在差异。通过两种方式计算了各种甲状腺癌风险因素的相对风险估计值：一种是仅将寄回明信片的患者作为病例，另一种是将所有病例纳入；某些风险因素的这些估计值有所不同。结果表明，使用明信片反馈系统可能导致回复率较低，从而可能产生有偏差的研究结果。
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