Validation of the Hebrew Version of the MacNew Heart Disease Health-related Quality of Life Questionnaire in Patients Undergoing Coronary Artery Bypass Surgery

Results: 775 patients completed the questionnaires at study entry, 599 (77%) of whom also provided data after 12 months. The internal consistency of the MacNew sub-scales was high (alpha coefficients: 0.88-0.94). There were moderate to high correlations between sub-scales of the MacNew and similar domains of the SF-36 (0.66-0.80). The MacNew scales discriminated between men and women, patients with and without congestive heart failure and between individuals with clinically significant symptoms of depression or anxiety and all other patients. The original three-factor structure was generally supported as most loadings met the 0.40 threshold on the expected factor. Patients attending cardiac rehabilitation programs after CABG surgery showed greater improvement in all the MacNew scales, particularly in physical functioning, compared to patients who had not participated in cardiac rehabilitation programmes.