Table:

Characteristics of 350 patients who had HIV drug resistance testing

Category	Aurum	Tygerberg
	Number (Percentage) or Median (interquartile range)	Number (Percentage) or Median (interquartile range)
Cohort n	184	166
Sex
Male	119 (65)	47 (28)
Female	65 (35)	119 (72)
Age, median	38 (33, 45)	35 (29, 41)
CD4 count at ART initiation	129 (64, 223)	116 (68, 174)
Single HIV RNA >1000	184 (100)	166 (100)
2 consecutive VL>1000 (WHO virologic failure definition)	88 (48)	99 (60)
WHO immunologic failure criteria	103 (56)	38 (23)
Duration of ART at time of resistance testing, months	20 (11, 31)	14 (9.2, 24)
ART regimen at resistance testing
NRTI + lamivudine
AZT	93 (51)	26 (16)
D4T	53 (29)	138 (83)
TDF	36 (20)	2 (1.2)
NNRTI
Efavirenz	131 (71)	80 (48)
Nevirapine	53 (29)	87 (52)