Table 1.

Parameter estimates determined by fitting Eq. (1) to the viral load data for 16 patients in the early group and six patients in the advanced group.

	T₀ (cells/ml)	log(V₀) (per ml)	δ (per day)	μ (per day)	τ (day)
P1	361	5.7	1.08	0.040	2.39
P2	140	5.6	0.89	0.033	6.78
P3	249	6.0	0.99	0.030	1.10
P4	408	5.4	0.50	0.022	0.99
P5	774	5.0	0.53	0.043	0
P7	870	5.0	1.31	0.058	0.98
P8	518	5.3	0.41	0.076	0
P9	446	5.4	0.80	0.044	0.95
P10	244	5.3	1.28	0.11	3.43
P11	250	5.8	0.39	0.050	2
P12	238	5.9	0.50	0.025	0
P13	514	4.5	0.57	0.027	1
P14	502	5.6	0.31	0.051	0
P16	304	6.5	1.04	0.056	0.80
P17	408	6.7	0.70	0.027	0.17
P18	832	4.9	0.67	0.057	0.84
Early/mean	441	5.54	0.75	0.047	1.35
Early/SD	221	0.57	0.32	0.023	1.71
Early/median	408	5.50	0.69	0.044	0.97
P1	25	5.3	0.83	0.039	0.98
P2	5	5.4	0.95	0.089	2.00
P3	6	5.0	0.56	0.103	2.99
P4	19	5.5	1.38	0.052	2.67
P5	15	6.0	0.72	0.043	0.08
P6	8	5.9	0.50	0.052	1.99
Advanced/mean	13	5.52	0.82	0.063	1.79
Advanced/SD	8.02	0.38	0.32	0.026	1.08
Advanced/median	11.5	5.45	0.78	0.052	2.00

The baseline viral load, V₀, and first and second phase decay rates, which are determined by δ and μ, respectively, are not significantly different between the groups. T₀, baseline CD4 cell count; τ, delay before viral load decline.