Comparison of self-assessment of libido at the 2 year point showed a dramatic improvement in the testosterone group compared to that in the controls (Fig. 1⇓). The incidence of new illnesses during the course of the study was not significantly different in the two groups for coronary artery disease, peripheral vascular disease, myocardial infarctions, angina, diabetes mellitus, or transient ischemic attacks (Table 3⇓). Benign prostatic hypertrophy (BPH) has long been a concern associated with long term testosterone administration. This study found that the control group had a higher rate of BPH than the study group, but the difference was not statistically significant.