Table 1.

Trends of incidence rates among Gram-negative pathogens causing all nosocomial infections and nosocomial bloodstream infections at National Taiwan University Hospital, 1991–2003

Microorganism	All nosocomial infections		Nosocomial bloodstream infection
	r	P	r	P
Escherichia coli	0.850	<0.001*	0.846	<0.001*
Klebsiella pneumoniae	0.696	0.008	0.829	<0.001*
Enterobacter spp.	0.013	0.968	0.669	0.012*
Serratia spp.	0.555	0.049	0.810	<0.001*
Proteus spp.	0.628	0.096	0.912	0.002*
Pseudomonas aeruginosa	0.367	0.005	0.904	0.006*
Acinetobacter spp.	0.730	0.218	0.729	<0.001*
Stenotrophomonas maltophilia	0.778	0.113	0.730	0.161
Other NFGNB	0.758	0.003*	0.258	0.395

NFGNB, non-fermentative Gram-negative bacilli.

^*Statistically significant association (r > 0.72, P < 0.05).