Table 3.

Qualitative comparisons of self-collected DBS results to (A) serum and (B) RT-PCR results and professionally collected DBS results to (C) serum and (D) RT-PCR results.

A)			Serum results
			−	+
	Self-collected DBS results	−	74	0	74	NPV = 100.0%
		+	2	32	34	PPV = 94.1%
			76	32	108	Total agreement:
			NPA = 97.4%	PPA = 100.0%		98.1%

B)			RT-PCR results
			−	+
	Self-collected DBS results	−	73	1	74	NPV = 98.6%
		+	2	33	35	PPV = 94.3%
		Total	75	34	109	Total agreement:
			NPA = 97.3%	PPA = 97.1%		97.2%

C)			Serum results
			−	+
	Professionally collected DBS results	−	79	0	79	NPV = 100.0%
		+	0	32	32	PPV = 100.0%
			79	32	111	Total agreement:
			NPA = 100.0%	PPA = 100.0%		100.0%

D)			RT-PCR results
			−	+
	Professionally collected DBS results	−	78	1	79	NPV = 98.7%
		+	0	32	32	PPV = 100.0%
			78	33	111	Total agreement:
			NPA = 100.0%	PPA = 97.0%		99.1%