TABLE 1.

Difference in percentage of discordant HIV viral load determinations from children versus from adults, stratified by ultrasensitive assay results

Range of ultrasensitive viral loads (no. of RNA copies/ml)	Samples from adults			Samples from children			Significancea of difference in % of discordance
	No. in rangeb	No. discordant	% Discordant	No. in rangeb	No. discordant	% Discordant
<50†	168**	38	22.6	59**	29	49.2	<0.001
50-350†	140**	59	42.1	47**	31	66.0	0.007
400-950†	64**	12	18.8	11**	6	54.5	0.019
1,000-9,500	108**	12	11.1	18	4	22.2	0.244
>10,000	189	14	7.4	10	1	10.0	0.552
All specimens	669	135	20.2	145	71	34.5	<0.001
<1,000c	372	109	29.3	117	66	56.4	<0.001

^aSignificance determined by Fisher's exact test.

^b**, includes specimens with results below the linear range of one or both of the assays.

^cCombined results from all specimens with ultrasensitive viral loads of <1,000 (rows marked with †).