TABLE 2.

Efficiencies of PK-Roche and CTAB-Roche extraction methods for amplification of M. tuberculosis DNA compared to culture^a

Method	Status	No. of specimens culture: (n = 144)
		P	N
PK-PCR	P	2	3
	N	4	60
	I	9	66
CTAB-PCR	P	4	14
	N	1	69
	I	10	46

^aP, positive; N, negative; I, inhibitory. Cutoff absorbance value, >0.300.