Question order might affect self-reported regular physical activity (PA) measured with items from the Behavioral Risk Factor Surveillance System (BRFSS) PA module.
A telephone survey was conducted using 2 forms (N = 1004, N = 212) with varying PA question order. The standard form presented moderate-PA, vigorous-PA, and walking questions, in that order, whereas the alternate form presented walking questions, followed by moderate-PA, and then vigorous-PA questions. Weighted, adjusted rates of vigorous PA, walking, meeting the Centers for Disease Control and Prevention (CDC) recommendation for moderate or vigorous PA, and moderate PA from each form were compared.
Vigorous PA and walking were similar regardless of question order. Meeting the CDC recommendation for moderate or vigorous PA was reported less often with the alternate form among 18- to 34-year-olds. Less moderate PA was reported with the alternate form overall and among 18- to 34-year-olds, women, whites, and those with a high school education or less.
Estimating PA and walking across sociodemographic strata with differing patterns of PA requires asking moderate-PA and vigorous-PA questions before walking questions. Asking walking questions first might lead to bias, especially for moderate PA. Walking, added to a survey with BRFSS moderate and vigorous PA items, should be placed after moderate and vigorous PA. Walking questions first may cause bias, especially for moderate PA.
Hutto, Sharpe, and Hooker are with the Prevention Research Center, and Addy the Dept of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208. Granner is with the School of Public Health, University of Nevada, Reno, NV 89557.