. 2002 Oct;8(10):1145–1151. doi: 10.3201/eid0810.020382

Table 3. Comparison of wet swab, wipe, and HEPA vacuum sock sampling methods, Brentwood postal facility, December 17–19, 2001.

Methods compared	No. samples	No. concordant samples^a		No. discordant samples^b		Cohen’s Kappa
Methods compared	No. samples	Positive (%)	Negative (%)	Positive method	Positive method	Cohen’s Kappa
Wet swab vs. wipe	67	35 (52)	8 (12)	Wet swab = 1	Wipe = 23	0.24
Wet swab vs. HEPA vacuum	58	27 (47)	10 (17)	Wet swab = 0	HEPA vacuum = 21	0.31
Wipe vs. HEPA vacuum	58	44 (76)	5 (9)	Wipe = 5	HEPA vacuum = 4	0.43

^aTwo samples from the same location are concordant if both positive or both negative for presence of Bacillus anthracis spores. ^bTwo samples from the same location are discordant if one is positive and the other negative for presence of B. anthracis spores.