TNNI3 and COVID-19: cTnI did not improve the c statistics or NRI when added to a basic risk model constructed on age, sex, and established risk factors for severe COVID-19 (c index 0.686; 95% CI, 0.654–0.718, vs 0.686; 95% CI, 0.654–0.718, P for comparison = 0.97; NRI 0.087, 95% CI, −0.204 to 0.240).