Question 2698
{"accessible":false,"alternatives":[{"id":13201,"text":"10%"},{"id":13202,"text":"20%"},{"id":13203,"text":"30%"},{"id":13204,"text":"40%"}],"archived":false,"correctAlternativeId":13202,"explanation":"\u003cp\u003eThe probability that someone with a disease will test negative is the opposite of sensitivity (this could be called the false negative rate), which in this example is 80%. To calculate the probability of the opposite of something occurring, you subtract the probability of it occurring from one: 1-sensitivity or 1-.80=.20 or 20%.\u003c/p\u003e","id":2698,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2885","nextQuestionPath":"/articles/sensitivity/questions/2697","relatedArticles":[{"id":34845,"title":"Sensitivity and specificity","link":"/articles/sensitivity-and-specificity?lang=gb"}],"alsoUsedIn":[{"id":1769,"kind":"Course","title":"Papa \u0026 Papa Bear's Medical Statistics Short Course - page 1769","link":"https://radiopaedia.org/courses/medical-statistics-short-course/pages/1769"}],"stem":"\u003cp\u003eA diagnostic test for lung cancer has the following metrics:\u003c/p\u003e\u003cp\u003ePositive Predictive Value=60%\u003c/p\u003e\u003cp\u003eNegative Predictive Value=70%\u003c/p\u003e\u003cp\u003eSensitivity=80%\u003c/p\u003e\u003cp\u003eSpecificity=90%\u003c/p\u003e\u003cp\u003eWhat is the probability that a person with lung cancer will test negative?\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/2698"}],"attemptsPercentages":[{"alternativeId":"13204","percentage":8},{"alternativeId":"13203","percentage":8},{"alternativeId":"13201","percentage":18},{"alternativeId":"13202","percentage":66}],"promptToLogin":false,"questionManager":false,"articleId":"sensitivity"}