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. 2020 Jan 15;9(2):e014376. doi: 10.1161/JAHA.119.014376

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© 2020 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Ascertainment of cases and controls for outcome stroke/transient ischemic attacks (TIA) after atrial fibrillation (AF). OAC indicates oral anticoagulant. *Patient is at risk 2 days after hospital discharge or 1 day after general practitioner AF diagnosis. ^†Active cancer defined as cancer recording between 90 days before first AF diagnosis and 90 days after being at risk. ^&ddagger;Stroke/TIA diagnosis or discharge day of stroke/TIA hospitalization between 14 days before AF and start of being at risk, or before the first vitamin K antagonist (VKA) prescription. ^§At day of AF. ^‖Matching on age at index day ±1 year, sex, calendar day of AF ±1 year, CHA₂DS₂‐VASc score at index day (without points for age and sex), and index day.