TABLE 7.

Number of false-positive HPV types detected per data set reported by laboratories participating in 2008, 2010, and 2011 proficiency studies in comparison with all data sets submitted in 2011

	No. of assays with false-positive results/total no. of assays (%)
No. of false-positive samples	Identical assays used in:			All tests run by laboratories that participated in:			No. of assays with false-positive results/total no. of data sets from 2011 (%)
	2008	2010	2011	2008	2010	2011
0	12/25 (48)	31/47 (66)	32/47 (68)	14/32 (44)	36/61 (59)	47/66 (71)	84/134 (63)
1	4/25 (16)	0/47 (0)	5/47 (11)	5/32 (16)	1/61 (1.6)	7/66 (11)	17/134 (13)
2	3/25 (12)	6/47 (13)	4/47 (8.5)	5/32 (16)	6/61 (9.8)	4/66 (6.1)	13/134 (9.7)
3	2/25 (8)	3/47 (6.4)	0/47 (0)	4/32 (12)	8/61 (13)	0/66 (0)	3/134 (2.2)
>3	4/25 (16)	7/47 (15)	6/47 (13)	4/32 (12)	10/61 (16)	8/66 (12)	17/134 (13)