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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Clin Trials. 2016 Jun 30;13(5):519–526. doi: 10.1177/1740774516656579

Table 3. Correspondence between event dates derived from Medicare and those found through adjudicated medical records.

Matching level Acute MI7 Stroke8 Abdominal aortic aneurysm9 Lower extremity peripheral vascular procedures9 Carotid artery treatment9
Exact match 82% 83% 89% 75% 90%
Within ± 1 day 88% 89% 79% 93%
Within ± 7 days 95% 89% 82% 96%
Within ± 30 days 94% 96% 92% 85% 96%
Differs by exactly 365 days 0.7% 0.4%