Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis.
Revue : Environmental Health, 13, p : 49
Auteurs Jerrett M., Mc ConnelR., Wolch , Chang R., Lam C., Dunton G., Gilliland F., Lurmann F., Islam T., Berhane K., (2014).
Le but de l'exercice est d'analyser pas à pas cette publication.
Répondez aux différentes questions. Certaines nécessiteront de votre part des recherches complémentaires sur d'autres documents de votre choix ou sur le web.
Protocole de l'étude
A cohort of children attending kindergarten and first grade (age 5–7 years) were enrolled during the 2002–03 school year from classrooms in 45 schools across 13 communities in Southern California (N = 4550). Parents provided informed consent and completed a detailed baseline and yearly follow-up questionnaires with information about asthma and related symptoms, demographic characteristics, physical activity, characteristics of homes, and other relevant covariates. Height and weight were measured without shoes at study entry and annually by a trained technician at the child's school. Technicians followed a standardized procedure to measure height and weight using a calibrated medical scale. Measurements were recorded to the nearest 1 cm and 1 lb (0.45 kg), respectively. These objective measures of height and weight allowed for accurate calculation of BMI.
Information on demographic characteristics from questions that were asked repeatedly in yearly questionnaires was updated for this analysis. We also collected information on physical activity, mainly in the form of programmed activities and team sports. The analytical data set was restricted to children who had two or more measurements of height and weight (N = 4257).
Homes of the children were geo-coded. Built-environment variables such as access to parks were calculated around the children's homes and schools and assigned to each child. Neighborhood and community social environmental variables, such as the poverty rate available from the U.S. Census, were also assigned to the residential address for inclusion as confounders in our multilevel models.
Question
De quel type d'étude s'agit-il ?
Quelle est l'hypothèse de départ des auteurs, que cherchent-ils à montrer ?
Le paramètre suivi est l'Indice de Masse Corporelle (ou IMC = Body Mass Index BMI en anglais). A partir d'une recherche, précisez ce qu'est l'IMC, comment se calcule-t-il ? Qu'elles sont les grandes catégories d'IMC chez l'adulte ? Comment s'interprète-t-il chez l'enfant ?
En plus de la taille et du poids, faites la liste des autres paramètres considérés par les auteurs ? Quelle est la raison de relever ces paramètres ?