Table 3. Percentage of bacterial isolates eliciting resistance to selected antimicrobials from tracheal aspirates in ICU patients at the Hospital for Tropical Diseases in Ho Chi Minh City, Vietnam.

Antimicrobial	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	OR	P value	95 %CI
Piperacillin/tazobactam	na	0.0	36.8	45.0	46.9	92.9	37.5	62.5	58.3	89.5	97.1	1.51	<0.001	1.33–1.71
Ticarcillin/clavulanic acid	na	na	na	na	na	42.9	25.0	62.5	66.7	84.2	97.1	2.09	<0.001	1.56–2.80
Ceftriaxone	100.0	70.6	89.5	95.0	93.8	92.9	6.3	68.8	100.0	100.0	97.1	1.07	0.304	0.94–1.20
Ceftazidime	83.3	64.7	73.7	65.0	68.8	78.6	12.5	62.5	75.0	94.7	97.1	1.15	0.008	1.04–1.27
Cefepime	na	na	na	na	na	28.6	50.0	37.5	58.3	94.7	97.1	2.25	<0.001	1.65–3.06
Imipenem	0.0	0.0	15.8	45.0	28.1	21.4	6.3	12.5	41.7	89.5	88.6	1.52	<0.001	1.35–1.72
Amikacin	33.3	52.9	79.0	60.0	59.4	85.7	50.0	50.0	75.0	73.7	94.3	1.16	0.003	1.05–1.29
Ofloxacin	83.3	47.1	36.8	65.0	59.4	71.4	50.0	43.8	58.3	47.4	22.9	0.89	0.012	0.81–0.97

na, Not applicable.