Table 1. Background Characteristics of Study Subjects.

	Subject Groups
	HIV Negative	All HIV-infected	Off Rx	Rx Viremic	Rx VL<500
Subject Number	10	40	17	12	11
Male	10	38	15	12	11
Age, mean +/− SD	47.5+/−6.3	45+/−5.0	42.5+/−5.7	46.3+/−4.8	47.5+/−7.7
Blood T cells, Median (IQR)
CD4+ cells/µl	909 (609–919)	251 (179–354)	282 (236–442)	211 (139–250)	256 (172–576)
CD8+ cells/ul	406 (338–513)	962 (704–1149)	900 (750–1033)	1018 (611–1268)	1069 (789–1132)
CD4:CD8 ratio	1.85 (1.48–2.26)	0.29 (0.18–0.46)	0.36 (0.29–0.51)	0.16 (0.14–0.25)	0.39 (0.21–0.54)
HIV RNA, log10 copies/ml, Median (IQR):
Plasma HIV RNA	NA	4.05 (1.83–4.88)	4.41 (4.00–4.89)	4.72 (3.71–5.25)	1.28 (1.28–1.76)
CSF HIV RNA	NA	3.02 (1.28–3.60)	3.38 (3.07–4.55)	2.88 (1.61–4.28)	1.28 (1.28–1.28)
CSF WBCs, Median (IQR):
Cells per ul	1 (0.0–3.0)	3 (1.0–8.0)	5 (2.0–11.0)	2.5 (1.0–9.5)	1 (0.0–3.0)

SD = standard deviation.

IQR = interquartile range.

NA = Not applicable.