TABLE 4.

Correlation coefficients of resistance to different drugs used to treat Pseudomonas aeruginosa infection in a general hospital in the United States^a

Drug	Correlation coefficientb
	CAZ	IPM	ATM	CIP	LVX	GEN	TOB	AMK
PIP	0.574***	0.305***	0.343***	0.208***	0.183***	0.158***	0.185***	0.067
CAZ		0.286***	0.331***	0.212***	0.163***	0.221***	0.162***	0.234***
IPM			0.010	0.292***	0.243***	0.333***	0.415***	0.161***
ATM				−0.022	0.001	0.000	0.040	0.004
CIP					0.759***	0.348***	0.353***	0.126**
LVX						0.244***	0.259***	0.102*
GEN							0.673***	0.575***
TOB								0.292***

^aData source, WHONET (n = 614). PIP, piperacillin; ATM, aztreonam; TOB, tobramycin.

^b***, P < 0.001; **, P < 0.01; *, P < 0.1.