TABLE 2.

Paired comparison of positivity rates between culture media from the 21 cases of PJI with anaerobic bacteria^a

Culture medium and no. (%) of positive samples	P value with indicated culture medium and no. (%) of positive samplesb
	Blood agar plate, 33 (31.4)	Chocolate agar plate, 56 (53.3)	Anaerobic broth medium, 79 (75.2)
Blood agar plate, 33 (31.4)
Chocolate agar plate, 56 (53.3)	<0.0001
Anaerobic broth medium, 79 (75.2)	<0.0001	<0.0001
Blood culture bottle, 57 (54.3)	<0.0001	0.8759	0.0002

^aThirteen cases of monomicrobial anaerobic PJI and eight cases of polymicrobial PJI with at least one anaerobe.

^bTotal number of samples, 105.