The importance of confounding in observational before-and-after studies of road safety measures

被引：86

作者：

Elvik, R ^{[1
]}

机构：

[1] Inst Transport Econ, N-0602 Oslo, Norway

来源：

ACCIDENT ANALYSIS AND PREVENTION | 2002年 / 34卷 / 05期

关键词：

before-and-after study; road safety measure; confounding; validity;

D O I：

10.1016/S0001-4575(01)00062-8

中图分类号：

TB18 [人体工程学];

学科分类号：

1201 ;

摘要：

This paper discusses the importance of confounding in observational before-and-after studies of road safety measures. The importance of the approach taken to controlling for confounding factors is shown by means of examples. It is shown that the size of the effect on accidents attributed to a road safety measure can be profoundly affected by which confounding factors are controlled for in an evaluation study, and the way this is done. Simple before-and-after studies, not controlling for any confounding factors should never be trusted and are likely to overstate the effects of road safety measures. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：631 / 635

页数：5