Analysis of the estimated normal cTnI group (< 0.030 μg/L) compared with the elevated cTnI groups (> 0.030 μg/L) showed evidently higher ratios of AF, CHF, CAD, and smoking in patients with cTnI levels > 0.03 μg/L. The gene discussed is TNNI3; the disease is atrial fibrillation.