International Journal of Epidemiology, Vol 26, S181-S189, Copyright © 1997 by International Epidemiological Association
MA Pols, PH Peeters, MC Ocke, N Slimani, HB Bueno-de-Mesquita and HJ Collette
BACKGROUND: The EPIC core questionnaire on lifestyle contains a number of
questions on physical activity designed to rank subjects according to level
of physical activity (short PA questionnaire). These questions are based on
a more extensive questionnaire designed to measure absolute total energy
expenditure (extensive PA questionnaire), that was validated in a pilot
study preceding EPIC. Reproducibility and relative validity of the short PA
questionnaire were estimated by selecting, from the pilot study data, the
answers to a number of questions from the extensive questionnaire that
resembled those actually included in the short version. METHODS: The
population of the pilot study consisted of 126 men and women aged between
20 and 70 years. Reproducibility was estimated by administering the
extensive questionnaire three times: at baseline, and after 5 and 11
months. In order to determine the relative validity of the extensive
questionnaire, a 3-day activity diary, repeated four times, was used as the
reference method. RESULTS: Over the study period (13 months), mean absolute
energy expenditure, estimated from the questions included in the short
questionnaire, was fairly constant in men but not in women.
REPRODUCIBILITY: Spearman correlation coefficients ranged from 0.47 to 0.89
in men, and from 0.49 to 0.81 in women. RELATIVE VALIDITY: Spearman
correlation coefficients between the short questionnaire and the diary were
between 0.32 and 0.81 for men, and between 0.28 and 0.72 for women.
CONCLUSIONS: The questions selected for the short questionnaire are not
suitable for estimating energy expenditure at an absolute level.
Reproducibility and relative validity of the ranking of subjects seemed
satisfactory and comparable to the extensive questionnaire. The results
imply that the short questionnaire is suitable for ranking subjects in the
EPIC study.
ARTICLES
Estimation of reproducibility and relative validity of the questions included in the EPIC Physical Activity Questionnaire
Department of Epidemiology, University of Utrecht, The Netherlands.
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