Plasma concentrations of hs-cTnI at 70 years of age , which were mainly within what is considered to be the reference interval , were related to new or larger UMIs at 75 years of age with an odds ratio of 1.98 per 1 unit increase in ln-transformed cTnI ( 95 % CI , 1.17-3 .35 ; P = 0.010 ) .