Testing the risk compensation hypothesis for safety helmets in alpine skiing and snowboarding.

Objective: The prevalence of helmet use by alpine skiers and snowboarders was estimated and self-reports on risk taking were assessed to test for potential risk compensation when using helmets in these sports.

Setting: Skiers and snowboarders were observed and interviewed at 34 resorts in the western United States and Canada.

Subjects: Respondents were 1779 adult skiers and snowboarders in the 2003 ski season.

Breast cancer yield for screening mammographic examinations with recommendation for short-interval follow-up.

Purpose: To compare cancer yield for screening examinations with recommendation for short-interval follow-up after diagnostic imaging work-up versus after screening mammography only.

Materials And Methods: From January 1996 to December 1999, Breast Imaging Reporting and Data System assessments and recommendations were collected prospectively for 1,171,792 screening examinations in 758,015 women aged 40-89 years at seven mammography registries in Breast Cancer Surveillance Consortium. Registries obtained waiver of signed consent or collected signed consent in accordance with institutional review boards at each location.