In a phenome-wide association study (PheWAS), four of the cTnI index variants were associated (P-value < 2.8 × 10−5) with diseases or continuous traits in UK Biobank (Supplementary Material, Tables S13 and S14) after correction for multiple testing: The variant rs7650482 was associated with cardiac arrhythmias, in particular atrial fibrillation and flutter, as well as waist hip ratio and standing height. This evidence concerns the gene TNNI3 and cardiac rhythm disease.