体力活动趋势估计中的无应答偏倚。
Non-response bias in physical activity trend estimates.
机构信息
Canadian Fitness and Lifestyle Research Institute, Ottawa, Canada.
出版信息
BMC Public Health. 2009 Nov 22;9:425. doi: 10.1186/1471-2458-9-425.
BACKGROUND
Increases in reported leisure time physical activity (PA) and obesity have been observed in several countries. One hypothesis for these apparently contradictory trends is differential bias in estimates over time. The purpose of this short report is to examine the potential impact of changes in response rates over time on the prevalence of adequate PA in Canadian adults.
METHODS
Participants were recruited in representative national telephone surveys of PA from 1995-2007. Differences in PA prevalence estimates between participants and those hard to reach were assessed using Student's t tests adjusted for multiple comparisons.
RESULTS
The number of telephone calls required to reach and speak with someone in the household increased over time, as did the percentage of selected participants who initially refused during the first interview attempt. A higher prevalence of adequate PA was observed with 5-9 attempts to reach anyone in the household in 1999-2002, but this was not significant after adjustment for multiple comparisons.
CONCLUSION
No significant impact on PA trend estimates was observed due to differential non response rates. It is important for health policy makers to understand potential biases and how these may affect secular trends in all aspects of the energy balance equation.
背景
在多个国家，报告的休闲时间体力活动（PA）和肥胖率都有所增加。对于这些明显矛盾的趋势，有一种假设是随着时间的推移，估计值存在差异偏差。本简短报告的目的是研究随着时间的推移，应答率的变化对加拿大成年人足够 PA 流行率的潜在影响。
方法
参与者是通过代表性的全国电话调查从 1995-2007 年招募的 PA。使用学生 t 检验评估参与者和难以接触到的参与者之间 PA 流行率估计值的差异，并进行了多次比较调整。
结果
随着时间的推移，要联系到家庭中的某人并与他们交谈所需的电话次数增加了，同时在第一次访谈尝试中最初拒绝的选定参与者的百分比也增加了。在 1999-2002 年期间，尝试联系家庭中的任何人 5-9 次时，观察到足够 PA 的流行率更高，但在进行多次比较调整后，这并不显著。
结论
由于差异的非应答率，对 PA 趋势估计没有观察到显著影响。对于卫生政策制定者来说，了解潜在的偏差以及这些偏差如何影响能量平衡方程各个方面的长期趋势非常重要。
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