EMRs had a sensitivity of 91 % ( 95 % CI = 69 % to 98 % ) and of specificity 96 % ( 95 % CI = 76 % to 100 % ) on thin , and a sensitivity of 100 % ( 95 % CI = 82 % to 100 % ) specificity of 48 % ( 95 % CI = 27 % to 69 % ) on obese cadavers .