TABLE 3.

Parameters governing changes in mortality and transmission with duration of infection used in the baseline model^a

Duration (yrs)	Dd	β
1	0.003	0.082
2	0.011	0.068
3	0.017	0.074
4	0.028	0.080
5	0.043	0.087
6	0.058	0.094
7	0.068	0.102
8	0.085	0.110
9	0.099	0.120
10	0.106	0.130
11	0.141	0.141
12	0.147	0.152
13	0.170	0.165
14	0.194	0.179
15	0.216	0.194

^aD_d, HIV-associated mortality at different stages of infection (year⁻¹) (7). β, transmission rate at different stages of infection (year⁻¹) (36, 43, 48). The death rate of an infected individual of age a and the duration of infection d are related to both a duration-of-infection specific death rate (D_d) and an age-specific factor (D_a). Therefore, HIV-associated mortality (D) is the product of D_a and D_d.