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. Here, TNNI3 is linked to cardiac arrhythmia.