A study is conducted in patients with HIV. The primary outcome is CD4 cell count, which is the measure of the disease. Lower CD4 counts are associated with more advanced disease. The investigators are interested in the association between vitamin and mineral supplements and CD4 count. A multiple regression analysis is performed relating CD4 count to the use of supplements (coded as 1= yes and 0 =no) and to the duration of HIV years (i.e.) the number of years between the diagnoses of HIV and the study date) For the analysis, y- CD4 count:

y = 501.41+12.67 supplements-30.23 duration of HIV

What is the expected CD4 count for a patient taking supplements who has had HIV for 2.5 years? What is the expected CD4 count for a patient not taking supplements who was diagnosed with HIV at study enrollment? What is the expected CD4 count for a patient not taking supplements who was diagnosed with HIV for 2.5 years.?