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American Journal of Epidemiology Advance Access published online on July 13, 2006
American Journal of Epidemiology, doi:10.1093/aje/kwj248
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American Journal of Epidemiology Copyright © 2006 by the Johns Hopkins Bloomberg School of Public Health All rights reserved; printed in U.S.A.
Received December 7, 2005
Accepted March 13, 2006

PRACTICE OF EPIDEMIOLOGY

Validation of a New Brief Physical Activity Survey among Men and Women Aged 60-69 Years

Ruth E. Taylor-Piliae 1 *, Linda C. Norton 1, William L. Haskell 1, Mohammed H. Mahbouda 1, Joan M. Fair 1, Carlos Iribarren 2, Mark A. Hlatky 3, Alan S. Go 2, and Stephen P. Fortmann 1

1 Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, CA
2 Division of Research, Kaiser Permanente of Northern California, Oakland, CA
3 Department of Health Research and Policy, Stanford University School of Medicine, Stanford, CA

* To whom correspondence should be addressed.
Ruth E. Taylor-Piliae, E-mail: rpiliae{at}stanford.edu


  Abstract

The Stanford Brief Activity Survey (SBAS), a new two-item physical activity survey, and the Stanford Seven-Day Physical Activity Recall (PAR) questionnaire were administered to men and women, aged 60-69 years, in the Atherosclerotic Disease VAscular functioN and genetiC Epidemiology (ADVANCE) Study. Frequency distributions of SBAS activity levels, as well as a receiver operating curve, were calculated to determine if the SBAS can detect recommended physical activity levels of 150 or more minutes/week at moderate or greater intensity, with PAR minutes/week. Data were collected between December 2001 and January 2004 from 1,010 participants (38% women) and recorded. Subjects were 65.8 (standard deviation: 2.8) years of age, 77% were married, 55% were retired, 23% were college graduates, and 68% were Caucasian. SBAS scores related significantly in an expected manner to PAR minutes/week (p < 0.01), energy expenditure (kcal/kg per day) (p < 0.01), and selected cardiovascular disease risk biomarkers (p < 0.01). The SBAS of physical activity at moderate intensity had a sensitivity of 0.73 and a specificity of 0.61. The SBAS is a quick assessment of the usual amount and intensity of physical activity that a person performs throughout the day. The SBAS needs further validation in other populations but demonstrated the potential of being a reasonably valid and inexpensive tool for quickly assessing habitual physical activity in large-scale epidemiology studies and clinical practice.

Keywords: aged; cardiovascular diseases; motor activity; reproducibility of results; research design; risk factors.
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