TABLE 4.

Multivariate Generalized Linear Regression of Cumulative Costs

Independent Variable	Coefficient	95% Confidence Interval
CD4 <201 (A)	1.44*	1.30, 1.59
CD4 201–350 (B)	0.50*	0.34, 0.67
CD4 351–500 (C)	0.15	–0.03, 0.32
CD4 >500 (reference)	—	—
Years in care
< 1 (reference)	—	—
1–2 (1)	0.59*	0.40, 0.78
2–3 (2)	1.03*	0.79, 1.26
3–4 (3)	1.16*	0.90, 1.42
4–5 (4)	1.32*	1.01, 1.64
5–6 (5)	1.60*	1.26, 1.94
6–7 (6)	1.85*	1.46, 2.23
7–8 (7)	2.19*	1.77, 2.61
CD4 by years in care
A-1	–0.25†	–0.47, –0.03
A-2	–0.40‡	–0.68, –0.13
A-3	–0.46‡	–0.78, –0.15
A-4	–0.36	–0.73, 0.01
A-5	–0.64*	–1.04, –0.25
A-6	–0.70*	–1.14, –0.27
A-7	–0.97*	–1.44, –0.49
B-1	0.07	–0.18, 0.33
B-2	0.03	–0.29, 0.34
B-3	0.07	–0.29, 0.43
B-4	0.14	–0.28, 0.56
B-5	–0.06	–0.50, 0.38
B-6	–0.02	–0.52, 0.49
B-7	–0.23	–0.80, 0.32
C-1	0.09	–0.18, 0.36
C-2	0.01	–0.33, 0.34
C-3	0.10	–0.28, 0.47
C-4	0.36	–0.09, 0.81
C-5	0.12	–0.35, 0.59
C-6	0.17	–0.37, 0.71
C-7	–0.06	–0.68, 0.55
Enrollment year
2000 (reference)
2001	–0.05	–0.16, 0.07
2002	0.01	–0.10, 0.13
2003	–0.12	–0.24, 0.01
2004	–0.14†	–0.26, –0.02
2005	–0.40*	–0.53, –0.28
2006	–0.37*	–0.50, –0.28
Male	–0.02	–0.09, 0.06
Race/ethnicity
White (reference)	—	—
Black	0.17*	0.09, 0.26
Hispanic	0.21*	0.11, 0.30
Other	–0.11	–0.29, 0.07
HIV risk group
MSM (reference)	—	—
HET	0.07	–0.01, 0.15
IDU	0.17‡	0.08, 0.28
Other	0.07	–0.05, 0.18
Age group
< 30 (reference)	—	—
31–10	0.26*	0.19, 0.34
41–50	0.31*	0.22, 0.40
>50	0.41*	0.28, 0.54

Model had gamma-distributed errors, resulting in variance proportional to the square of the mean, and a logarithmic link. Model also included indicators for each clinical site.

^*P < 0.001.

^†P < 0.05.

^‡P < 0.01.

MSM indicates men who have sex with men; HET, heterosexual HIV transmission; IDU, injection drug use HIV transmission