{"id":931,"date":"2014-05-28T21:00:50","date_gmt":"2014-05-28T20:00:50","guid":{"rendered":"https:\/\/blogs.bmj.com\/adc\/?p=931"},"modified":"2014-05-26T21:21:18","modified_gmt":"2014-05-26T20:21:18","slug":"statsminiblog-incidence-and-prevalence","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/adc\/2014\/05\/28\/statsminiblog-incidence-and-prevalence\/","title":{"rendered":"StatsMiniBlog: Incidence and Prevalence"},"content":{"rendered":"<p><a href=\"https:\/\/blogs.bmj.com\/adc\/files\/2013\/08\/Image78.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-674\" src=\"https:\/\/blogs.bmj.com\/adc\/files\/2013\/08\/Image78.gif\" alt=\"StatsMiniBlog\" width=\"180\" height=\"76\" \/><\/a>There are two relatively simple terms that get splattered about and are sometimes confused and\u00a0can cause all sorts of difficulties.<\/p>\n<p><strong>Incidence<\/strong> &#8211; the number of people who <strong>develop<\/strong> a condition <strong>in<\/strong> a specific period of time.<\/p>\n<p>(I think of this a bit like an &#8216;incident&#8217; &#8211; a thing that happened.It probably has the same etymological root. Or something)<\/p>\n<p><strong>Prevalence<\/strong> &#8211; the number of people who <strong>have<\/strong> a condition <strong>at<\/strong> a specific period in time<\/p>\n<p>(This, like a prevailing wind, is the weight of a disease burden at one point in history.)<\/p>\n<p>But there is a touch more complexity &#8230;<!--more--><\/p>\n<p>If you want to know\u00a0what proportion of children in special schools have visual difficulties at any one point in time, you&#8217;ll be asking for the <strong>prevalence<\/strong> of occular problems. \u00a0If you want to be planning\u00a0your print order for information packs from new diabetics, you&#8217;ll want the local\u00a0<strong>incidence<\/strong> of DM.<\/p>\n<p>Where conditions are not cured, and those affected are unlikely to die*, then the <strong>cumulative incidence<\/strong> is going to be, near as you like, the same as the prevalence.<\/p>\n<p>&#8211; Archi<\/p>\n<p>&nbsp;<\/p>\n<p>* die within the time from developing the diagnosis and you wondering what proportion of folk have it. Not &#8220;be immortal&#8221; sort of &#8220;unlikely to die&#8221;.<!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are two relatively simple terms that get splattered about and are sometimes confused and\u00a0can cause all sorts of difficulties. Incidence &#8211; the number of people who develop a condition in a specific period of time. (I think of this a bit like an &#8216;incident&#8217; &#8211; a thing that happened.It probably has the same etymological [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/adc\/2014\/05\/28\/statsminiblog-incidence-and-prevalence\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2676],"tags":[],"class_list":["post-931","post","type-post","status-publish","format-standard","hentry","category-stats"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>StatsMiniBlog: Incidence and Prevalence - ADC Online Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.bmj.com\/adc\/2014\/05\/28\/statsminiblog-incidence-and-prevalence\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"StatsMiniBlog: Incidence and Prevalence - ADC Online Blog\" \/>\n<meta property=\"og:description\" content=\"There are two relatively simple terms that get splattered about and are sometimes confused and\u00a0can cause all sorts of difficulties. Incidence &#8211; the number of people who develop a condition in a specific period of time. 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