TABLE 3.

Effects of the study characteristics on estimates of DOR as determined by multiple regression analysis^a

Variable	Relative DOR (95% CI)	P
At least two culture media used	2.44 (0.51-11.59)	0.26
Any hybridization method	3.49 (0.16-14.59)	0.09
Nested PCR	0.72 (0.14-3.63)	0.69
Real-time PCR	8.85 (1.82-74.44)	0.04
Threshold (S)		0.93
Intercept		0.01

^aThe coding used in multiple regression analysis was as follows: for M. tuberculosis culture, at least two media used, 1; no information on culture media used, 1 (not reported in the table); one culture medium used, 0; for hPCR type, nested, 1; real-time PCR, 1; “conventional” PCR, 0; for amplicon detection method, any hybridization method, 1; gel electrophoresis plus UV, 0.