Table 1.

Exposure to different classes of antiretroviral drugs among individuals from the UK CHIC study

		Nucleoside reverse transcriptase inhibitors		Protease inhibitors		Non-nucleoside reverse transcriptase inhibitors		Any antiretroviral drug
Year	No of patients under follow up	No (%) exposed	Median (range) No of drugs	No (%) exposed	Median (range) No of drugs	No (%) exposed	Median (range) No of drugs	No (%) exposed	Median (range) No of drugs
1996	7588	3086 (40.7)	0 (0-5)	1063 (14.0)	0 (0-3)	291 (3.8)	0 (0-2)	3130 (41.2)	0 (0-9)
1997	7918	4277 (54.0)	2 (0-6)	2656 (33.5)	0 (0-4)	910 (11.5)	0 (0-2)	4328 (54.7)	2 (0-11)
1998	8599	5231 (60.8)	2 (0-7)	3607 (42.0)	0 (0-4)	2040 (23.7)	0 (0-3)	5266 (61.2)	3 (0-14)
1999	9170	5992 (65.3)	2 (0-7)	3973 (43.3)	0 (0-5)	3363 (36.7)	0 (0-4)	6017 (65.6)	3 (0-14)
2000	9775	6643 (68.0)	2 (0-7)	4114 (42.1)	0 (0-6)	4461 (45.6)	0 (0-4)	6661 (68.1)	3 (0-16)
2001	10 549	7340 (69.6)	2 (0-7)	4312 (40.9)	0 (0-6)	5315 (50.4)	1 (0-4)	7356 (69.7)	3 (0-16)
2002	11 200	7973 (71.2)	2 (0-7)	4561 (40.7)	0 (0-6)	5986 (53.5)	1 (0-4)	7987 (71.3)	4 (0-16)