Determinants of children's physical activity behavior : influence of opportunities for physical activity in elementary schools
Notice bibliographique
Résumé
With dramatic increases in obesity in North America and declining levels of physical activity (PA), identification of the determinants of PA in children that are amenable to improvement, is a public health priority. The purpose of this thesis is fourfold: to identify factors that predict decline in PA among school children; to investigate if selected (school-level) opportunities for PA at school are associated with overall (student-level) PA behaviour; to describe school-based opportunities for PA; and finally, to identify environmental correlates of 'high opportunity' schools. Not participating in school-based team sports predicted decline to an inactive status after one year in boys and after two years in girls. Other one-year predictors of decline among boys included moderate (Vs high) baseline PA (odds ratio (OR) = 1.66, 95% confidence interval (CI): 0.91, 3.05, low self-efficacy (OR = 2.13, 95% CI: 1.03, 2.71)), born outside Canada (OR = 2.13, 95% CI: 1.31, 3.46) and Asian origin (OR = 1.81, 95% CI: 0.93, 3.55) in boys and moderate PA (OR = 1.91, 95% CI: 1.10, 3.32), low self-efficacy (OR = 1.70, 95% CI: 1.15, 2.49), watching ≥4 TV programs per day (OR = 1.40, 95% CI: 0.97, 2.02), mother unemployed (OR = 1.54, 95% CI: 1.07, 2.23), and grade 5 (Vs. grade 4) (OR = 1.35, 95% CI: 0.94, 1.93) in girls. Two-year predictors included moderate baseline PA (OR = 2.52, 95% CI: 0.84, 7.53, and born outside Canada (OR = 1.96, 95% CI: 0.91, 4.20) in boys and moderate baseline PA (OR = 2.75, 95% CI: 1.01, 7.49), watching 4 or more TV programs per day (OR = 1.93, 95% CI: 0.99, 3.74), and born outside Canada (OR = 1.85, 95% CI: 0.96, 3.55) in girls. In the second analysis, 8% of the variance in children's PA behaviour was at the between-school level. MLM analyses did not identify significant main effects of either 'high PE' or 'sports playing fields' for physical activity outcomes. However, significant cross-level interactions were identified, such that overweight boys who attended high PE schools and/or schools equipped with sports playing fields reported higher levels of PA and were less likely to be inactive than overweight boys attending schools that did not offer these opportunities. In the third analysis, there was substantial variation in PA opportunities between schools. Higher opportunity for PA at school was associated with role modeling of PA by school principals (OR = 2.40, 95% CI: 1.23, 3.46); high interest in links to the municipality (OR = 1.95, 95% CI: 1.18, 3,21); fewer barriers related to cost and human r These findings illustrate the central role of the school environment in influencing children's activity levels, and provide direction to program and policy makers interested in enhancing opportunities for PA available to children at school, and in helping children maintain active lifestyles. (Abstract shortened by UMI.)
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,004 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,001 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».