Fig. 2.

Detection of heart failure in inpatients using different approaches (percentage of all inpatients). The solid line indicates the prevalence detected when applying the automated algorithm A_F1 (for details refer to “Methods”). Intermittent lines indicate detection using ICD codes or other information tags that dominantly contributed to the detection of heart failure. Each patient entered analysis only once per year; if patients attended the hospital multiple times, the first case of each patient per year was used