Table 1.

Mean difference in viral loads, standard deviations, and 95% confidence intervals of HCV RNA, HIV RNA, and HBV DNA over 1 year to 9.1 years for specimens stored at −20°C and −70°C

Virus	Time period (yr)	Assay	Storage temp (°C)	Difference in viral load (log10)		95% CI
				Mean	SD	Upper	Lower
HCV	1	bDNA	−20	−0.13	0.09	−0.11	−0.16
	1.2	CAP-CTM	−20	−0.05	0.15	0.02	−0.11
	1.2	CAP-CTM	−70	−0.11	0.18	−0.03	−0.19
	9	Monitor	−70	−0.35	0.19	−0.27	−0.43
HIV	2.3	bDNA	−20	−0.18	0.17	−0.11	−0.25
	9.1	Monitor	−70	−0.22	0.51	−0.14	−0.3
HBV	1.8	CAP-CTM	−20	−0.21	0.37	−0.16	−0.25
	5	bDNA	−20	−0.04	0.19	−0.03	−0.07
	4	bDNA	−70	0.01	0.23	0.04	−0.26