Table 3.

Exposure to antiretrovirals of 615 children aged 2-12 years after 1 January 1997 in the collaborative HIV paediatric study (CHIPS)^*

Antiretroviral	Exposure (total child years)
Zidovudine	754
Lamivudine	1111
Abacavir	494
Didanosine	773
Stavudine	933
Tenofovir	47
Nevirapine	510
Efavirenz	277
Nelfinavir	638
Ritonavir	102
Lopinavir/ritonavir	156

^*Additional child time exposed to other antiretrovirals: zalcitabine (42 child years); emtricitabine (1); saquinavir (17); indinavir (25); amprenavir (14); and tipranavir, atazanavir, and enfuvirtide (all <1 child year).