Patients who entered this study had a mean age of 36 years and, although the majority were white males, approximately 25% of study participants were female. Forty-six percent of participants in the TDF arm had a viral load above 100,000, while 43% in the d4T arm had viral loads above 100,000. Similarly, 39% of participants in the TDF arm had a low CD4 count and 38% in the d4T arm had less than 200 cells respectively. A very high number of patients continued this study for 48 weeks, with only 9% in each arm discontinuing the study.