In a population of 33 women aged 51-71 yr, two physical activity questionnaires (a modified Baecke questionnaire and the pre-EPIC questionnaire) were tested for repeatability (5 and 11 months). For assessment of relative validity, the questionnaires were compared with a physical activity diary (12 d) as the main reference method, a single 24-h Caltrac accelerometer score, and energy intake estimated from a 24-h dietary recall repeated 12 times. Repeatability of the questionnaires at 5 months was 0.82(Baecke) and 0.42 (pre-EPIC), at 11 months 0.73 and 0.60, respectively. Correlation with the activity diary was 0.51 for the Baecke and 0.64 for the pre-EPIC questionnaire. Correlation with the Caltrac was 0.22 for both questionnaires, and with energy intake -0.21 and -0.43, respectively. Factor analysis suggested that the questionnaires and the diary measured a common aspect of activity, which could be interpreted as “reported normal physical activity.” Women who reported sweating or breathlessness during the past week scored significantly higher only on the Baecke questionnaire. It was concluded that the two questionnaires seemed to be able to rank older women according to physical activity in epidemiological studies.
Department of Epidemiology, Faculty of Medicine, Utrecht University, Utrecht; and EMGO-Institute, Faculty of Medicine, Vrije Universiteit, Amsterdam, THE NETHERLANDS
Submitted for publication April 1995.
Accepted for publication January 1996.
The authors thank Ir Marga Ocké (National Institute for Public Health and Environmental Protection, Bilthoven) for providing the data on energy intake, and Dr. Paul Westers (Centre for Biostatistics, University of Utrecht) for his advice on statistical analysis.
This study was supported financially by the Europe Against Cancer Programme of the Commission of European Communities (Soc 93:102848).
Address for correspondence: M. A. Pols, M.D., Department of Epidemiology, University of Utrecht, P.O. Box 80035, 3508 TA Utrecht, the Netherlands.