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A procedure to correct proxy-reported weight in the National Health Interview Survey, 1976–2002

机译:1976-2002年美国国家健康访问调查中纠正代理人报告的体重的程序

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Background Data from the National Health Interview Survey (NHIS) show a larger-than-expected increase in mean BMI between 1996 and 1997. Proxy-reports of height and weight were discontinued as part of the 1997 NHIS redesign, suggesting that the sharp increase between 1996 and 1997 may be artifactual. Methods We merged NHIS data from 1976–2002 into a single database consisting of approximately 1.7 million adults aged 18 and over. The analysis consisted of two parts: First, we estimated the magnitude of BMI differences by reporting status (i.e., self-reported versus proxy-reported height and weight). Second, we developed a procedure to correct biases in BMI introduced by reporting status. Results Our analyses confirmed that proxy-reports of weight tended to be biased downward, with the degree of bias varying by race, sex, and other characteristics. We developed a correction procedure to minimize BMI underestimation associated with proxy-reporting, substantially reducing the larger-than-expected increase found in NHIS data between 1996 and 1997. Conclusion It is imperative that researchers who use reported estimates of height and weight think carefully about flaws in their data and how existing correction procedures might fail to account for them. The development of this particular correction procedure represents an important step toward improving the quality of BMI estimates in a widely used source of epidemiologic data.
机译:全国健康访问调查(NHIS)的背景数据显示,1996年至1997年之间,平均BMI增长超过了预期。身高和体重的替代报告在1997年NHIS重新设计中被中止,表明1996年和1997年可能是虚构的。方法我们将1976年至2002年的NHIS数据合并到一个包含约170万名18岁及以上成年人的单一数据库中。该分析包括两个部分:首先,我们通过报告状态(即自我报告的体重与代理人报告的身高和体重)来估算BMI差异的大小。其次,我们开发了一种程序来纠正由报告状态引起的BMI偏差。结果我们的分析证实,体重的替代报告倾向于向下偏倚,偏倚程度因种族,性别和其他特征而异。我们制定了一种校正程序,以最大程度地减少与代理人报告相关的BMI偏低,从而大大减少1996年至1997年间NHIS数据中发现的超出预期的增加。结论必须使用报告的身高和体重的估计值的研究人员慎重考虑数据中的缺陷以及现有的更正程序可能无法解决这些问题。在广泛使用的流行病学数据来源中,这一特殊校正程序的发展代表了朝着提高BMI评估质量迈出的重要一步。

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