TNNT2 and atrial fibrillation: The outliers above and below the upper and lower limits of agreement (LOA) in the Bland–Altman plot are patients from group 2 (No MI, with hs-cTnI and hs-cTnT both elevated) and group 3 (No MI, with hs-cTnI normal and hs-cTnT elevated), and these patients had several comorbidities, such as CKD, atrial fibrillation or a previous mitral valve replacement.