International Journal of Epidemiology, Vol 28, 53-57, Copyright © 1999 by International Epidemiological Association
F Dominguez-Berjon, C Borrell, M Nebot and A Plasencia
BACKGROUND: Several studies have used a simplified approach for the
assessment of physical activity such as the frequency of exercise- induced
sweating. In this study leisure-time physical activity has been assessed
using this and another more detailed measure. SUBJECTS AND METHODS: A
sample of 4171 adults answered the Health Interview Survey of Barcelona in
1992. The respondents were classified into categories depending on
participation in moderate and/or intense physical activity (> or =20
min) and also according to the frequency of exercise-induced sweating: 0,
1-2 and > or =3 times/week. Agreement between the two measures was
calculated using the weighted Kappa (Kw) statistic with 95% confidence
intervals (95% CI). Stratified analyses were performed. RESULTS: Prevalence
of physical activity > or =3 times/week was lower with the sweat
question (12.5%) than with the questions about the frequency of performance
of selected activities (19.6%). The physical activity patterns by age,
gender and overweight were similar for the two measures, but differed by
month of the year. Agreement was lower among the older age categories and
was higher among males (Kw = 0.59, 95% CI: 0.57-0.62) than among females
(Kw = 0.48, 95% CI: 0.46-0.50). Overall, the agreement was higher in the
hotter months (Kw = 0.72 among males and 0.58 among females). CONCLUSIONS:
In the assessment of physical activity in the population by means of the
sweat question there can be interference from other variables, apart from
the intensity of the activity, which influence sweating during the
exercise. Further assessments of the validity of exercise-induced sweating
in representative samples of the general population would be useful.
ARTICLES
Physical activity assessment in population surveys: can it really be simplified?
Municipal Institute of Health, Barcelona, Spain.
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