With each of these criteria, there is trade-off between sensitivity and specificity. Several recent studies involving reasonably large number of patients and using magnetic resonance imaging or echocardiography to determine hypertrophy have shown that each of the four sets of criteria discussed above has high specificity, in the range of 85 -90% meaning that in 10-15 %, the ECGs will be falsely positive; and low sensitivity, ranging from 25 to 55% meaning that at least half of the patients with left ventricular hypertrophy as determined by the imaging technique employed may not demonstrate any of these ECG criteria, (i.e. their ECGs will be falsely negative). Adjusting the criteria in order to increase sensitivity and thereby reduce the number of false negatives will lessen specificity and increase the number of false positives.