TABLE 1.

Correlations among antiretroviral susceptibilities^a

Drug	Degree of correlation (r2) of indicated drug
	Rit	Nel	Saq	Amp	ABC	3TC	AZT	d4T	ddC	ddI	EFV	Nev	Del
PIs
Ind	0.79	0.70	0.69	0.55	0.24	0.14	0.26	0.11	0.10	0.15	0.11	0.14	0.09
Rit		0.69	0.67	0.58	0.25	0.15	0.27	0.11	0.09	0.15	0.10	0.13	0.08
Nel			0.63	0.45	0.25	0.18	0.26	0.10	0.10	0.14	0.10	0.13	0.08
Saq				0.49	0.21	0.10	0.24	0.11	0.08	0.14	0.10	0.12	0.08
Amp					0.21	0.08	0.22	0.12	0.10	0.15	0.08	0.09	0.06
NRTIs
ABC						0.42	0.35	0.24	0.36	0.38	0.08	0.10	0.04
3TC							0.09	0.03	0.25	0.21	0.04	0.06	0.02
AZT								0.29	0.14	0.19	0.06	0.08	0.03
d4T									0.19	0.23	0.03	0.03	0.02
ddC										0.33	0.02	0.03	0.01
ddI											0.06	0.07	0.05
NNRTIs
EFV											0.70	0.62
Nev													0.68
Del

^aThe degree of correlation in fold change in 50% inhibitory concentration compared to that of a reference strain (log scale) among over 4,900 clinically derived recombinant isolates is expressed as r². Even with low values of r², most correlations are highly statistically significant due to the large number of observations. Ind, indinavir; Rit, ritonavir; Nel, nelfinavir; Saq, saquinavir; Amp, amprenavir; ABC, abacavir; 3TC, lamivudine; AZT, zidovudine; d4T, stavudine; ddC, zalcitabine; ddI, didanosine; EFV, efavirenz; Nev, nevirapine; Del, delavirdine.