{"id":6571,"date":"2026-10-13T23:20:18","date_gmt":"2026-10-13T16:20:18","guid":{"rendered":"https:\/\/dykhoa.com\/blog\/?post_type=thuat_ngu&#038;p=6571"},"modified":"2026-10-13T23:20:18","modified_gmt":"2026-10-13T16:20:18","slug":"nguy-co-tuong-doi-va-nguy-co-tuyet-doi","status":"publish","type":"thuat_ngu","link":"https:\/\/dykhoa.com\/blog\/thuat-ngu\/nguy-co-tuong-doi-va-nguy-co-tuyet-doi\/","title":{"rendered":"Nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i (relative risk, absolute risk) l\u00e0 g\u00ec?"},"content":{"rendered":"<p>Tin s\u1ee9c kh\u1ecfe th\u01b0\u1eddng vi\u1ebft &#8220;t\u0103ng g\u1ea5p \u0111\u00f4i nguy c\u01a1&#8221; hay &#8220;gi\u1ea3m 34% nguy c\u01a1&#8221;. \u0110\u00f3 l\u00e0 c\u00e1ch n\u00f3i theo <strong>nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i<\/strong>. Nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i (risk ratio) l\u00e0 t\u1ef7 s\u1ed1 nguy c\u01a1 x\u1ea3y ra bi\u1ebfn c\u1ed1 \u1edf hai nh\u00f3m, c\u00f2n hi\u1ec7u s\u1ed1 nguy c\u01a1 (risk difference, c\u00f2n g\u1ecdi l\u00e0 gi\u1ea3m nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i) l\u00e0 ph\u1ea7n ch\u00eanh l\u1ec7ch gi\u1eefa hai nguy c\u01a1 quan s\u00e1t \u0111\u01b0\u1ee3c (Higgins v\u00e0 cs., 2019). <strong>Nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i<\/strong> tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi \u0111\u01a1n gi\u1ea3n h\u01a1n: trong 100 hay 1.000 ng\u01b0\u1eddi, bao nhi\u00eau ng\u01b0\u1eddi g\u1eb7p bi\u1ebfn c\u1ed1.<\/p>\n<h2>V\u00ec sao c\u00f9ng m\u1ed9t k\u1ebft qu\u1ea3 l\u1ea1i nghe r\u1ea5t kh\u00e1c nhau?<\/h2>\n<p>Nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i th\u01b0\u1eddng l\u00e0 nh\u1eefng con s\u1ed1 nh\u1ecf, trong khi thay \u0111\u1ed5i t\u01b0\u01a1ng \u0111\u1ed1i t\u01b0\u01a1ng \u1ee9ng l\u1ea1i tr\u00f4ng r\u1ea5t l\u1edbn (Gigerenzer v\u00e0 cs., 2007). N\u0103m 1995, c\u01a1 quan qu\u1ea3n l\u00fd thu\u1ed1c \u1edf Anh c\u1ea3nh b\u00e1o m\u1ed9t th\u1ebf h\u1ec7 thu\u1ed1c tr\u00e1nh thai l\u00e0m t\u0103ng nguy c\u01a1 huy\u1ebft kh\u1ed1i &#8220;g\u1ea5p \u0111\u00f4i&#8221;, t\u1ee9c t\u0103ng 100%. Th\u1ef1c t\u1ebf, c\u1ee9 7.000 ph\u1ee5 n\u1eef d\u00f9ng th\u1ebf h\u1ec7 thu\u1ed1c c\u0169 th\u00ec kho\u1ea3ng 1 ng\u01b0\u1eddi b\u1ecb huy\u1ebft kh\u1ed1i, v\u1edbi thu\u1ed1c m\u1edbi con s\u1ed1 n\u00e0y l\u00e0 2: m\u1ee9c t\u0103ng tuy\u1ec7t \u0111\u1ed1i ch\u1ec9 l\u00e0 1 tr\u00ean 7.000. Theo Gigerenzer v\u00e0 cs. (2007), \u0111\u1ee3t ho\u1ea3ng s\u1ee3 \u01b0\u1edbc t\u00ednh k\u00e9o theo kho\u1ea3ng 13.000 ca ph\u00e1 thai t\u0103ng th\u00eam trong n\u0103m sau \u0111\u00f3.<\/p>\n<ul>\n<li><strong>T\u01b0\u01a1ng \u0111\u1ed1i:<\/strong> &#8220;t\u0103ng 100%&#8221;, &#8220;gi\u1ea3m 34%&#8221;.<\/li>\n<li><strong>Tuy\u1ec7t \u0111\u1ed1i:<\/strong> &#8220;t\u1eeb 1 l\u00ean 2 tr\u00ean 7.000 ng\u01b0\u1eddi&#8221;, &#8220;t\u1eeb 3,9% xu\u1ed1ng 2,5%&#8221;.<\/li>\n<\/ul>\n<h2>Ng\u01b0\u1eddi l\u00e0m truy\u1ec1n th\u00f4ng s\u1ee9c kh\u1ecfe n\u00ean tr\u00ecnh b\u00e0y ra sao?<\/h2>\n<p>T\u1ed5ng quan Cochrane c\u1ee7a Akl v\u00e0 cs. (2011) cho th\u1ea5y khi l\u1ee3i \u00edch \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y b\u1eb1ng m\u1ee9c gi\u1ea3m nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i, ng\u01b0\u1eddi \u0111\u1ecdc th\u01b0\u1eddng c\u1ea3m nh\u1eadn hi\u1ec7u qu\u1ea3 l\u1edbn h\u01a1n so v\u1edbi m\u1ee9c gi\u1ea3m tuy\u1ec7t \u0111\u1ed1i d\u00f9 c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u. Nguy\u00ean t\u1eafc an to\u00e0n l\u00e0 lu\u00f4n n\u00eau nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i khi c\u00f3 v\u00e0 khi kh\u00f4ng c\u00f3 can thi\u1ec7p, ho\u1eb7c \u0111\u1eb7t hai con s\u1ed1 c\u1ea1nh nhau (Gigerenzer v\u00e0 cs., 2007). C\u00e1c nguy\u00ean t\u1eafc vi\u1ebft cho c\u00f4ng ch\u00fang kh\u00e1c c\u00f3 trong b\u00e0i <a href=\"https:\/\/dykhoa.com\/blog\/viet-noi-dung-suc-khoe-dung-cach\/\">vi\u1ebft n\u1ed9i dung s\u1ee9c kh\u1ecfe \u0111\u00fang c\u00e1ch<\/a>.<\/p>\n<p><strong>Ph\u00e2n bi\u1ec7t v\u1edbi s\u1ed1 ng\u01b0\u1eddi c\u1ea7n \u0111i\u1ec1u tr\u1ecb (NNT):<\/strong> NNT \u0111\u01b0\u1ee3c suy ra t\u1eeb hi\u1ec7u s\u1ed1 nguy c\u01a1, t\u1ee9c nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i (Higgins v\u00e0 cs., 2019).<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>Nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i c\u00f3 ph\u1ea3i l\u00e0 con s\u1ed1 sai?<\/h3>\n<p>Kh\u00f4ng. \u0110\u00e2y l\u00e0 th\u01b0\u1edbc \u0111o h\u1ee3p l\u1ec7; v\u1ea5n \u0111\u1ec1 ch\u1ec9 n\u1ea3y sinh khi n\u00f3 \u0111\u1ee9ng m\u1ed9t m\u00ecnh, khi\u1ebfn ng\u01b0\u1eddi \u0111\u1ecdc kh\u00f4ng bi\u1ebft nguy c\u01a1 ban \u0111\u1ea7u l\u1edbn hay nh\u1ecf.<\/p>\n<h3>Khi \u0111\u1ecdc tin, n\u00ean h\u1ecfi c\u00e2u g\u00ec?<\/h3>\n<p>H\u00e3y h\u1ecfi: &#8220;T\u1eeb bao nhi\u00eau th\u00e0nh bao nhi\u00eau, tr\u00ean bao nhi\u00eau ng\u01b0\u1eddi, trong bao l\u00e2u?&#8221;, r\u1ed3i \u0111\u1ecdc th\u00eam b\u00e0i <a href=\"https:\/\/dykhoa.com\/blog\/mot-nghien-cuu-moi-co-du-de-ket-luan\/\">m\u1ed9t nghi\u00ean c\u1ee9u m\u1edbi c\u00f3 \u0111\u1ee7 \u0111\u1ec3 k\u1ebft lu\u1eadn<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i kh\u00e1c nhau th\u1ebf n\u00e0o? V\u00ec sao tin &#8220;t\u0103ng g\u1ea5p \u0111\u00f4i nguy c\u01a1&#8221; d\u1ec5 g\u00e2y ho\u1ea3ng s\u1ee3 v\u00e0 c\u00e1ch \u0111\u1ecdc con s\u1ed1 r\u1ee7i ro cho \u0111\u00fang.<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","nhom_thuat_ngu":[473],"class_list":["post-6571","thuat_ngu","type-thuat_ngu","status-publish","hentry","nhom_thuat_ngu-truyen-thong-suc-khoe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i (relative risk, absolute risk) l\u00e0 g\u00ec? - Dy Khoa Blog<\/title>\n<meta name=\"description\" content=\"Nguy c\u01a1 t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 nguy c\u01a1 tuy\u1ec7t \u0111\u1ed1i kh\u00e1c nhau th\u1ebf n\u00e0o? 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