Increasingly surveys are using interviewers to collect objective health measures, also known as biomeasures, to replace or supplement traditional self-reported health measures. However, the extent to which interviewers affect the (im)precision of biomeasurements is largely unknown. This article investigates interviewer effects on several biomeasures collected in three waves of the National Social Life, Health, and Aging Project (NSHAP). Overall, we find low levels of interviewer effects, on average. This nevertheless hides important variation with touch sensory tests being especially high with 30% interviewer variation, and smell tests and timed balance/walk/chair stands having moderate interviewer variation of around 10%. Accounting for contextual variables that potentially interact with interviewer performance, including housing unit type and presence of a third person, failed to explain the interviewer variation. A discussion of these findings, their potential causes, and their implications for survey practice is provided.

越来越多的调查使用访调员来收集客观的健康措施（也称为生物措施），以替代或补充传统的自我报告的健康措施。但是，访调员在多大程度上影响生物测量的精度。本文调查访调员对在国家社会生活，健康与老龄化项目（NSHAP）的三波浪潮中收集的几种生物测量的影响。总体而言，我们发现访调员的影响平均较低。然而，这掩盖了重要的变化，其中触摸感官测试特别高，只有30％的访问者变化，而气味测试和定时平衡/步行/椅子看台的中等访问者变化约为10％。考虑可能与面试官表现互动的上下文变量，包括住房单元类型和第三人的存在，未能解释面试官的变化。讨论了这些发现，它们的潜在原因及其对调查实践的影响。