Question 2855
{"accessible":false,"alternatives":[{"id":13929,"text":"lead time"},{"id":13928,"text":"length time"},{"id":13932,"text":"length time and lead time"},{"id":13927,"text":"overdiagnosis"},{"id":13931,"text":"overdiagnosis and lead time"},{"id":13930,"text":"overdiagnosis and length time"}],"archived":false,"correctAlternativeId":13930,"explanation":"\u003cp\u003eSome cancers don't progress and won't put the patient's life at risk. Finding these cancers with screening doesn't help patients, but we may mistakenly credit the screening and the subsequent treatment for a good outcome. Because we have numerous opportunities (screening intervals) to detect slowly growing cancers with screening, screen-detected cancers tend to be less aggressive than those that are detected clinically after symptoms occur. This tendency is known as length time bias. The combination of overdiagnosis and length time may result in an overestimation of the benefit of screening.\u003c/p\u003e","id":2855,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2857","nextQuestionPath":"/articles/lung-cancer-screening/questions/2854","relatedArticles":[],"alsoUsedIn":[{"id":1823,"kind":"Course","title":"Papa \u0026 Papa Bear's Medical Statistics Short Course - page 1823","link":"https://radiopaedia.org/courses/medical-statistics-short-course/pages/1823"}],"stem":"\u003cp\u003eWhat type of cancer screening bias(es) result(s) in overestimation of the benefits of screening?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2855"}],"attemptsPercentages":[{"alternativeId":"13932","percentage":17},{"alternativeId":"13930","percentage":83},{"alternativeId":"13929","percentage":0},{"alternativeId":"13928","percentage":0},{"alternativeId":"13927","percentage":0},{"alternativeId":"13931","percentage":0}],"promptToLogin":false,"questionManager":false,"articleId":"lung-cancer-screening"}