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  1. Reproducibility of retrospective assessment of outdoor time-activity patterns as an individual determinant of long-term ambient ozone exposure.

    Article - En anglais

    Background

    Long-term effects of ambient ozone pollution are not clearly established to date.

    Epidemiological assessment of these effects might benefit from improved exposure measures.

    Tools to retrospectively assess long-term time-activity patterns as a potentially important co-predictor of true exposure have not yet been developed.

    Methods

    Three self-completed questionnaires for the retrospective assessment of outdoor time-activity patterns were tested in 168 lifelong residents (ages 17-21) of California.

    A test-retest design (within 5-7 days) was employed. (1) Based on a set of questions (AQUES) on outdoor'heavy'and'moderate'activity, h/day engaged in activity were derived.

    Definition of activity levels was based on published data regarding energy expenditure of physical activities. (2) A table format (ATAB) asked quantitative questions for each activity engaged in. (3) A 24-hour-log (A24H) had to be completed to indicate time spent outdoors in four levels of activity (heavy, moderate, light, at rest) on a'typical day' (n=44).

    Test-retest reliability was assessed.

    Comparison across approaches was restricted to the subgroup of 44 students that completed all three approaches.

    Results

    All approaches yielded reasonably reliable results (between-test variance 13-39% of total variance, Spearman rank correlations : 0.68-0.86 for time spent in outdoor activities).

    Population mean values differed across approaches, ranging from 1. (...)

    Mots-clés Pascal : Ozone, Pollution air, Epidémiologie, Evaluation, Exposition, Rétrospective, Long terme, Homme, Méthode étude, Activité, Exercice physique, Extérieur, Etude temporelle, Questionnaire

    Mots-clés Pascal anglais : Ozone, Air pollution, Epidemiology, Evaluation, Exposure, Retrospective, Long term, Human, Investigation method, Activity, Physical exercise, Outer, Temporal study, Questionnaire

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 98-0056869

    Code Inist : 002B30A01A1. Création : 14/05/1998.