Results
The final analytic sample consisted of 682 subjects. Approximately 10% of the sample was Age distribution seen in Figure 1. African American, with the remainder being of other race/ethnicity (Figure 2). Chi-square tests were conducted to compare individuals with suspected HCM to controls in rates of LVH, T wave inversion, LBBB, and left atrial enlargement. Rates of ECG abnormalities across HCM patients and controls are presented in Figure 3. Consistent with our hypotheses, our findings indicated that rates of LVH were higher in patients with suspected HCM (23.5%) than in patients without suspected HCM (5.6%) ( = .002). Similarly, we found elevated rates of T wave inversion among patients with suspected HCM (17.6%) in comparison to controls (4.1%) (p  = .007). Comparisons of rates of LBBB and left atrial abnormalities were unable to be conducted, as there were no patients with suspected HCM who showed evidence of these abnormalities on ECG in our sample. Examinations of the presence of any identified ECG abnormality showed that less than 25% of suspected HCM patients had an ECG abnormality observed on screening, though rates of any abnormality among HCM patients (23.5%) remained significantly elevated relative to controls (8.7%) (p  = .036).