{"id":3836,"date":"2024-07-16T22:43:00","date_gmt":"2024-07-16T13:43:00","guid":{"rendered":"https:\/\/plaza.umin.ac.jp\/~OIO\/?p=3836"},"modified":"2025-08-06T14:23:33","modified_gmt":"2025-08-06T05:23:33","slug":"%e8%87%a8%e5%ba%8a%e6%a4%9c%e6%9f%bb%e3%81%ae%e5%b0%a4%e5%ba%a6%e6%af%94%e3%82%92%e5%88%a9%e7%94%a8%e3%81%97%e3%81%a6%e8%a8%ba%e6%96%ad%e7%a2%ba%e7%8e%87%e3%82%92%e8%a8%88%e7%ae%97","status":"publish","type":"post","link":"https:\/\/plaza.umin.ac.jp\/~OIO\/?p=3836","title":{"rendered":"Calculating Diagnostic Probability Using Likelihood Ratios in Clinical Testing"},"content":{"rendered":"\n<p>\u300c\u5c24\u5ea6\u6bd4\uff08Likelihood Ratio\uff09\u300d\u3092\u7528\u3044\u3066\u8a3a\u65ad\u306e\u78ba\u7387\u3092\u9ad8\u3081\u308b\u624b\u6cd5\u306b\u3064\u3044\u3066\u306e\u89e3\u8aac\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c24\u5ea6\u6bd4\u30a2\u30d7\u30ed\u30fc\u30c1\u3068\u81e8\u5e8a\u691c\u67fb\u306e\u81e8\u5e8a\u7684\u89e3\u91c8<\/h2>\n\n\n\n<p>\u307e\u305a\u306f\u3001<a href=\"https:\/\/www.mhlw.go.jp\/seisakunitsuite\/bunya\/kenkou_iryou\/iryou\/topics\/tp240424-01.html\">\u7b2c\uff11\uff11\uff18\u56de\u533b\u5e2b\u56fd\u5bb6\u8a66\u9a13\u554f\u984c\u3000\u4ee4\u548c6\u5e742\u67083\u65e5\u30fb4\u65e5\u5b9f\u65bd\u3000\u554f\u984cC<\/a>\u3000\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>63 \u3053\u306e\u60a3\u8005\u306e\u5927\u8178\u306b\u4f55\u3089\u304b\u306e\u75c5\u5909\u304c\u3042\u308b\u691c\u67fb\u524d\u78ba\u7387\uff08\u4e8b\u524d\u78ba\u7387\uff09\u3092 20 % \u3068\u3057\u305f\u3068\u304d\u3001\u4fbf\u6f5c\u8840\u53cd\u5fdc\u967d\u6027\u3067\u3042\u3063\u305f\u5834\u5408\u306e\u691c\u67fb\u5f8c\u78ba\u7387\u306b\u6700\u3082\u8fd1\u3044\u306e\u306f\u3069\u308c\u304b\u3002\u3000\u305f\u3060\u3057\u3001\u4fbf\u6f5c\u8840\u53cd\u5fdc\u306e\u611f\u5ea6\u306f 80 %\u3001\u7279\u7570\u5ea6\u306f 90 % \u3068\u3059\u308b\u3002<br>\uff41\u300033 %<br>\uff42\u300053 %<br>\uff43\u300057 %<br>\uff44\u300067 %<br>\uff45\u300097 %<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u300c\u5c24\u5ea6\u6bd4\uff08Likelihood Ratio\uff09\u300d\u3092\u7528\u3044\u3066\u8a3a\u65ad\u306e\u78ba\u7387\u3092\u9ad8\u3081\u308b\u624b\u6cd5\u306f\u3001<strong>\u30d9\u30a4\u30ba\u7d71\u8a08<\/strong>\u306b\u57fa\u3065\u3044\u305f\u65b9\u6cd5\u3067\u3059\u3002\u533b\u5e2b\u56fd\u5bb6\u8a66\u9a13\u4ee5\u5916\u306b\u3082\u5185\u79d1\u5b66\u4f1a\u306e\u5c02\u9580\u533b\u8a66\u9a13\u3067\u3082\u3057\u3070\u3057\u3070\u554f\u308f\u308c\u308b\u554f\u984c\u3067\u3059\u3002\u672c\u7a3f\u3067\u306fcopilot\u306e\u89e3\u8aac\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd0d \u5c24\u5ea6\u6bd4\u3068\u306f\uff1f<\/h3>\n\n\n\n<p>\u691c\u67fb\u7d50\u679c\u304c\u967d\u6027\u307e\u305f\u306f\u9670\u6027\u3060\u3063\u305f\u3068\u304d\u306b\u3001\u75c5\u6c17\u306e\u53ef\u80fd\u6027\u304c\u3069\u308c\u3060\u3051\u9ad8\u307e\u308b\uff08\u307e\u305f\u306f\u4f4e\u304f\u306a\u308b\uff09\u304b\u3092\u793a\u3059\u6307\u6a19\u3067\u3059\u3002\u3053\u306e\u8a66\u9a13\u554f\u984c\u3067\u306f\u967d\u6027\u3060\u3063\u305f\u306e\u3067\u3001\u967d\u6027\u5c24\u5ea6\u6bd4\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u967d\u6027\u5c24\u5ea6\u6bd4\uff08LR+\uff09<\/strong><br>LR+=\u611f\u5ea6\/(1\u2212\u7279\u7570\u5ea6)\u200b&nbsp;\u2192 \u75c5\u6c17\u306e\u4eba\u304c\u691c\u67fb\u967d\u6027\u306b\u306a\u308b\u78ba\u7387 \u00f7 \u75c5\u6c17\u3067\u306a\u3044\u4eba\u304c\u691c\u67fb\u967d\u6027\u306b\u306a\u308b\u78ba\u7387<\/li>\n\n\n\n<li><strong>\u9670\u6027\u5c24\u5ea6\u6bd4\uff08LR\u2212\uff09<\/strong><br>LR\u2212=\u7279\u7570\u5ea6\/(1\u2212\u611f\u5ea6)\u200b&nbsp;\u2192 \u75c5\u6c17\u306e\u4eba\u304c\u691c\u67fb\u9670\u6027\u306b\u306a\u308b\u78ba\u7387 \u00f7 \u75c5\u6c17\u3067\u306a\u3044\u4eba\u304c\u691c\u67fb\u9670\u6027\u306b\u306a\u308b\u78ba\u7387<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\udde0 \u8a3a\u65ad\u78ba\u7387\u3092\u9ad8\u3081\u308b\u624b\u9806\uff08\u30d9\u30a4\u30ba\u306e\u5b9a\u7406\u306e\u5fdc\u7528\uff09<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e8b\u524d\u78ba\u7387\uff08Pre-test Probability\uff09\u3092\u8a2d\u5b9a\u3059\u308b<\/strong><br>\u533b\u5e2b\u306e\u7d4c\u9a13\u3084\u75ab\u5b66\u30c7\u30fc\u30bf\u304b\u3089\u3001\u691c\u67fb\u524d\u306b\u75c5\u6c17\u3067\u3042\u308b\u78ba\u7387\u3092\u898b\u7a4d\u3082\u308a\u307e\u3059\u3002\u4f8b\uff1a50%<\/li>\n\n\n\n<li><strong>\u4e8b\u524d\u30aa\u30c3\u30ba\u306b\u5909\u63db\u3059\u308b<\/strong><br>\u4e8b\u524d\u30aa\u30c3\u30ba=\u4e8b\u524d\u78ba\u7387\/(1\u2212\u4e8b\u524d\u78ba\u7387)\u200b<\/li>\n\n\n\n<li><strong>\u5c24\u5ea6\u6bd4\u3092\u639b\u3051\u308b<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u691c\u67fb\u304c\u967d\u6027\u306a\u3089\uff1a<br>\u4e8b\u5f8c\u30aa\u30c3\u30ba=\u4e8b\u524d\u30aa\u30c3\u30ba\u00d7LR+<\/li>\n\n\n\n<li>\u691c\u67fb\u304c\u9670\u6027\u306a\u3089\uff1a<br>\u4e8b\u5f8c\u30aa\u30c3\u30ba=\u4e8b\u524d\u30aa\u30c3\u30ba\u00d7LR\u2212<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4e8b\u5f8c\u30aa\u30c3\u30ba\u3092\u4e8b\u5f8c\u78ba\u7387\u306b\u5909\u63db\u3059\u308b<\/strong><br>\u4e8b\u5f8c\u78ba\u7387=\u4e8b\u5f8c\u30aa\u30c3\u30ba\/(1+\u4e8b\u5f8c\u30aa\u30c3\u30ba)<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u5b9f\u4f8b\uff1a\u56fd\u5bb6\u8a66\u9a13\u306e\u8a3a\u65ad<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e8b\u524d\u78ba\u7387\uff1a20%<\/li>\n\n\n\n<li>\u611f\u5ea6\uff1a80%\u3001\u7279\u7570\u5ea6\uff1a90%<\/li>\n\n\n\n<li>\u691c\u67fb\u7d50\u679c\uff1a\u967d\u6027<\/li>\n<\/ul>\n\n\n\n<p>\u8a08\u7b97\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LR+ = 0.80 \/ (1 &#8211; 0.90) = 8<\/li>\n\n\n\n<li>\u4e8b\u524d\u30aa\u30c3\u30ba = 0.2 \/ (1 &#8211; 0.2) = 0.25<\/li>\n\n\n\n<li>\u4e8b\u5f8c\u30aa\u30c3\u30ba = 0.25 \u00d7 8 = 2<\/li>\n\n\n\n<li>\u4e8b\u5f8c\u78ba\u7387 = 2 \/ (1 + 2) \u2248&nbsp;<strong>67%<\/strong>\u3000\uff08\u56fd\u5bb6\u8a66\u9a13\u306e\u6b63\u89e3\u3068\u3082\u4e00\u81f4\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u2192 \u691c\u67fb\u967d\u6027\u306b\u3088\u308a\u3001\u8a3a\u65ad\u78ba\u7387\u304c20% \u2192 67%\u306b\u4e0a\u6607\uff01<br>\u60aa\u6027\u75be\u60a3\u306e\u5834\u5408\u306f\u3001\u526f\u4f5c\u7528\u3092\u4f34\u3046\u975e\u5e38\u306b\u5f37\u529b\u306a\u6cbb\u7642\u3092\u5b9f\u65bd\u3057\u307e\u3059\u306e\u3067\u3001\u3053\u306e\u3042\u3068\u753b\u50cf\u691c\u67fb\u3092\u884c\u3044\u3001\u816b\u7624\u304c\u3042\u308c\u3070\u305d\u306e\u90e8\u4f4d\u3067\u751f\u691c\u3057\u3001\u75c5\u7406\u7d44\u7e54\u691c\u67fb\u3092\u884c\u3044\u3001\u8a3a\u65ad\u3084\u75c5\u5909\u306e\u5e83\u304c\u308a\u3092\u8a73\u3057\u304f\u8abf\u3079\u3066\u304b\u3089\u6cbb\u7642\u306b\u5165\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u56fd\u5bb6\u8a66\u9a13\u4ee5\u5916\u306e\u4e8b\u4f8b\u3082\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\ude7a \u4e8b\u4f8b\uff1a\u6025\u6027\u5fc3\u7b4b\u6897\u585e\uff08AMI\uff09\u306e\u8a3a\u65ad<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 \u80cc\u666f\u60c5\u5831\uff08\u51fa\u5178\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8ad6\u6587<\/strong>\uff1a<a href=\"https:\/\/www.jstage.jst.go.jp\/article\/generalist\/36\/3\/36_191\/_pdf\">\u4f50\u3005\u6728\u6625\u559c\u300c\u8a3a\u65ad\u63a8\u8ad6\u3068\u78ba\u7387\u2500\u30d9\u30c3\u30c9\u30b5\u30a4\u30c9\u3067\u306e\u30d9\u30a4\u30ba\u306e\u5b9a\u7406\u2500\u300d<br>\u65e5\u672c\u30d7\u30e9\u30a4\u30de\u30ea\u30fb\u30b1\u30a2\u9023\u5408\u5b66\u4f1a\u8a8c 2013; 36(3): 191-197<\/a><\/li>\n<\/ul>\n\n\n\n<p>\u3053\u306e\u8ad6\u6587\u3067\u306f\u3001<strong>ST\u4e0a\u6607<\/strong>\u3068\u3044\u3046\u5fc3\u96fb\u56f3\u6240\u898b\u304c\u6025\u6027\u5fc3\u7b4b\u6897\u585e\u306e\u8a3a\u65ad\u306b\u304a\u3044\u3066\u975e\u5e38\u306b\u6709\u52b9\u3067\u3042\u308b\u3053\u3068\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcca \u8a08\u7b97\u30b9\u30c6\u30c3\u30d7<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u2460 \u4e8b\u524d\u78ba\u7387\uff08Pre-test Probability\uff09<\/h3>\n\n\n\n<p>\u533b\u5e2b\u304c\u60a3\u8005\u306e\u75c7\u72b6\uff08\u80f8\u75db\u306a\u3069\uff09\u304b\u3089\u3001\u6025\u6027\u5fc3\u7b4b\u6897\u585e\u306e\u53ef\u80fd\u6027\u3092**30%**\u3068\u898b\u7a4d\u3082\u3063\u305f\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>Ppre=0.30<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2461 \u4e8b\u524d\u30aa\u30c3\u30ba\u306b\u5909\u63db<\/h3>\n\n\n\n<p>\u4e8b\u524d\u30aa\u30c3\u30ba = Ppre \/ (1\u2212Ppre) = 0.30 \/ 0.70 \u2248 0.429<br><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2462 ST\u4e0a\u6607\u306e\u967d\u6027\u5c24\u5ea6\u6bd4\uff08LR+\uff09<\/h3>\n\n\n\n<p>\u8ad6\u6587\u306b\u3088\u308b\u3068\u3001ST\u4e0a\u6607\u306e<strong>LR+ = 13.0<\/strong>&nbsp;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2463 \u4e8b\u5f8c\u30aa\u30c3\u30ba\u306e\u8a08\u7b97<\/h3>\n\n\n\n<p>\u4e8b\u5f8c\u30aa\u30c3\u30ba = \u4e8b\u524d\u30aa\u30c3\u30ba \u00d7 LR+ = 0.429 \u00d7 13.0 \u2248 5.577<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2464 \u4e8b\u5f8c\u78ba\u7387\u306b\u5909\u63db<\/h3>\n\n\n\n<p>Ppost = \u4e8b\u5f8c\u30aa\u30c3\u30ba \/ (1+\u4e8b\u5f8c\u30aa\u30c3\u30ba) = 5.577 \/ (1+5.577) \u2248 5.577\/ 6.577\u22480.848<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u7d50\u679c<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u691c\u67fb\u524d\u306e\u8a3a\u65ad\u78ba\u7387<\/strong>\uff1a30%<\/li>\n\n\n\n<li><strong>ST\u4e0a\u6607\u3092\u78ba\u8a8d\u5f8c\u306e\u8a3a\u65ad\u78ba\u7387<\/strong>\uff1a<strong>\u7d0484.8%<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u2192&nbsp;<strong>\u8a3a\u65ad\u78ba\u7387\u304c\u5927\u5e45\u306b\u4e0a\u6607<\/strong>\u3057\u3001\u6025\u6027\u5fc3\u7b4b\u6897\u585e\u306e\u53ef\u80fd\u6027\u304c\u975e\u5e38\u306b\u9ad8\u3044\u3068\u5224\u65ad\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5fc3\u7b4b\u6897\u585e\u306e\u5834\u5408\u306f\u3001\u65e9\u671f\u306e\u6cbb\u7642\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u306e\u3067\u3053\u306e\u7a0b\u5ea6\u306e\u78ba\u7387\u3067\u3042\u308c\u3070\u5373\u5faa\u74b0\u5668\u306e\u3054\u5c02\u9580\u306e\u5148\u751f\u306b\u6cbb\u7642\u3092\u304a\u9858\u3044\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u6b21\u306b\u3053\u306e\u624b\u6cd5\u306b\u5bfe\u3059\u308b\u610f\u898b\u3092\u8ff0\u3079\u305f\u8ad6\u6587\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7d39\u4ecb\u3059\u308b\u6587\u732e\u306f\u3000<a href=\"https:\/\/www.frontiersin.org\/journals\/immunology\/articles\/10.3389\/fimmu.2021.655262\/full\">Fierz W, Bossuyt X. Likelihood Ratio Approach and Clinical Interpretation of Laboratory Tests. <em>Front Immunol<\/em>. 2021 Apr 16 ;12:655262 . doi: 10.3389\/fimmu.2021.655262. <\/a>\u3067\u3059<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. \u306a\u305c\u5c24\u5ea6\u6bd4\u304c\u63d0\u6848\u3055\u308c\u305f\u306e\u304b<\/h4>\n\n\n\n<ul 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class=\"wp-block-heading\">2. \u5c24\u5ea6\u6bd4\uff08LR\uff09\u306e\u6982\u5ff5\u3068\u6b74\u53f2\u7684\u80cc\u666f<\/h4>\n\n\n\n<ul 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