Persson P G, Ahlbom A, Norell S E
Department of Epidemiology, Karolinska Institutet, Stockholm, Sweden.
Int J Epidemiol. 1990 Jun;19(2):343-8. doi: 10.1093/ije/19.2.343.
The aim of this study was to evaluate the use of retrospective information on diet in relation to the information originally reported. Hospital controls (n = 131) who participated in a case-control study on diet and pancreatic cancer in Stockholm, Sweden, answered a second postal questionnaire four years later about their current and previous food consumption. The food consumption was dichotomized for the purpose of the analysis. In relation to the original information, the use of retrospective information overestimated previous food consumption among subjects with increased intake, while retrospective information underestimated previous food consumption among subjects with decreased intake. These tendencies were slightly more pronounced in the age group 60-79 years than in the age group 40-59 years. For subjects with unchanged food consumption, there was a high agreement between original and retrospective information. Considerable differential misclassification could be introduced in an epidemiological study if cases and non-cases differ with regard to changes in food consumption.
本研究的目的是评估饮食回顾性信息与最初报告信息之间的关联。参与瑞典斯德哥尔摩一项关于饮食与胰腺癌的病例对照研究的医院对照组（n = 131）在四年后通过第二次邮寄问卷回答了他们当前和既往的食物摄入情况。为了分析目的，将食物摄入量进行了二分法分类。与原始信息相比，回顾性信息高估了摄入量增加的受试者之前的食物摄入量，而回顾性信息低估了摄入量减少的受试者之前的食物摄入量。这些趋势在60 - 79岁年龄组中比在40 - 59岁年龄组中更为明显。对于食物摄入量没有变化的受试者，原始信息和回顾性信息之间存在高度一致性。如果病例组和非病例组在食物摄入量变化方面存在差异，那么在流行病学研究中可能会引入相当大的差异错分。
