One-hundred and seventy-nine consecutive CHD patients with a body mass index > 26kg/m but < 30kg/m were randomly assigned to two groups ( group A : 53 men , 39 women , average age 61.8311.84 years , and group B : 40 men , 47 women , average age 62.2511.37 years ) based on tube voltage , contrast agent , and algorithm used .