Physical activity at age 12 and adult breast cancer risk (United States).

摘要: Objectives: Some epidemiologic studies suggest that adolescent physical activity reduces subsequent breast cancer risk. To examine this question further, we analyzed data on at age 12 had been collected as part of the Carolina Breast Cancer Study (CBCS). Methods: The CBCS is a population-based, case-control study 527 white and 337 African-American cases 790 controls, frequency-matched race. Respondents were asked whether, to what extent, they engaged in four specific activities (walking school, biking competitive training, performing vigorous household chores). Results: Women who reported participation any modest reduction risk (odds ratio (OR): 0.8, 95% confidence interval (CI): 0.6-1.0). Using an index measuring approximate number episodes per week, analyses revealed inverse relationships for nearly all levels relative no activity; weighting by metabolic equivalent scores produced similar results. Conclusions: Our findings support hypothesis may protect against adult cancer, even moderate levels.