Unadjusted Kaplan-Meier curves for the cumulative probability of all-cause death in 4 categories of patients: (A) with DTNPV1 and index ECG referred by cardiologist vs. non-cardiologist, and those with Zero PpV1 and index ECG referred by cardiologist vs. non- cardiologist. (B) with DTNPV1 vs. those with Zero PpV1, and either diagnosed or non-diagnosed with cardiovascular disease (CVD), defined as the presence at least one of the following: (1) current use of cardiovascular medications, (2) index ECG referred by a cardiologist, (3) ICD-9-CM code.