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Using data from a large international survey (<jats:italic>n<\/jats:italic>\u00a0=\u00a015\u00a0834; median age 72\u00a0years; 30\u00b71% female), we studied predictors of poor anticoagulation control (percentage of International Normalized Ratio values within therapeutic range below 75%) and developed a simple prediction model. The following variables were identified as risk factors for poor anticoagulation control and included in the final model: higher intensity of therapeutic range (odds ratio [<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>] on every level 1\u00b79; 95% confidence interval [<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>] 1\u00b78\u20132\u00b70), long intervals between measurements (&gt;14\u00a0d; 1\u00b75; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1\u00b73\u20131\u00b77), female sex (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content> 1\u00b73; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1\u00b72\u20131\u00b74), and management other than <jats:styled-content style=\"fixed-case\">PSM<\/jats:styled-content> (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content> 1\u00b74; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1\u00b72\u20131\u00b76). At a threshold of 0\u00b72 (at least one variable present), the model predicted poor anticoagulation control with a sensitivity of 85\u00b73% (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 84\u00b70, 86\u00b74) and a specificity of 28\u00b75% (27\u00b76, 29\u00b75). The area under the receiver operated characteristic curve was 0\u00b765. Using the proposed prediction model, physicians will be able to identify patients with a low chance of performing well, considering additional training, regular follow\u2010up, or adjustment of therapeutic ranges.<\/jats:p>","DOI":"10.1111\/bjh.14273","type":"journal-article","created":{"date-parts":[[2016,10,13]],"date-time":"2016-10-13T23:01:10Z","timestamp":1476399670000},"page":"677-685","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Predictors of anticoagulation quality in 15\u00a0834 patients performing patient self\u2010management of oral anticoagulation with vitamin K antagonists in real\u2010life practice: a survey of the International Self\u2010Monitoring Association of Orally Anticoagulated Patients"],"prefix":"10.1111","volume":"175","author":[{"given":"Christian","family":"Schaefer","sequence":"first","affiliation":[{"name":"International Self\u2010Montioring Association of Oral Anticoagulated 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