After adjusting for covariates ( age , educational level , sex , apolipoprotein E 4 , depression , diabetes mellitus , hypertension , stroke , body mass index , and coronary artery disease ) we found no significant association between clinical or subclinical hypothyroidism and MCI ( odds ratio [ OR ] , 0.99 [ 95 % CI , 0.66-1 .48 ] and 0.88 [ 0.38-2 .03 ] , respectively ) .