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. 2018 Oct 24;3(11):1081–1089. doi: 10.1001/jamacardio.2018.3466

Figure 1. Data Collection and Data Management.

Figure 1.

All acute myocardial infarctions (MIs) within the Swedish Web-System for Enhancement and Development of Evidence-Based Care in Heart Disease Evaluated According to Recommended Therapies (SWEDEHEART) registry between 1998 and 2013 were included. Weather data were then merged with each MI on date of symptom onset and coronary care unit. Because a nationwide daily mean of weather parameters was calculated, weather data from small cities admitting less than 400 MIs during the study period were omitted.