TABLE 2.

Differences in log₁₀ RNA concentration among estimates based on VQA or kit standards for determining nominal copy number^a

Kit comparison	Kit standard-based difference					VQA standard-based difference
	Mean	Median	SD	P value	No.b	Mean	Median	SD	P value	No.b
Monitor vs ES bDNA	0.38	0.37	0.28	<0.001	42	0.04	0.03	0.32	0.42	42
Monitor vs NASBA-QT	−0.18	−0.15	0.29	<0.001	45	0.02	0.03	0.39	0.76	45
NASBA-QT vs ES bDNA	0.57	0.56	0.39	<0.001	37	0.01	0.10	0.48	0.91	37
Monitor vs ES bDNA (all)	0.32	0.36	0.36	<0.001	311	0.04	0.04	0.37	0.11	293
Monitor vs ES bDNA (placebo)	0.31	0.34	0.38	<0.001	159	0.03	0.03	0.43	0.37	152
Monitor vs ES bDNA (zidovudine)	0.32	0.37	0.33	<0.001	152	0.04	0.04	0.30	0.13	141

^aThe upper section represents the subset of samples used for a three-way comparison, while the lower section is the entire data set obtained with a two-way comparison. The P value is that obtained by testing the null hypothesis that the average difference was zero. 

^bNumber of specimens.