Table 3.

Resistance rates of E. coli strains according the age groups

Antimicrobial Agent	Age < 50	Age ≥ 50	P value
Ampicillin	54.7%	56.3%	0.880
Ampicillin-sulbactam	29.3%	40.6%	0.254
Amoxicillin-clavulonate	29.3%	40.6%	0.254
Cefuroxime	17.3%	37.5%	0.024*
Ceftriaxone	13.3%	21.9%	0.268
Fluoroquinolone	22.7%	31.3%	0.349
Gentamicin	5.8%	6.3%	0.585
TMP-SMX**	46.7%	28.1%	0.074
TMP-SMX+FQ***	18.7%	15.6%	0.706

* = P < 0.05; ** = co-trimoxazole; *** = co-trimoxazole, fluoroquinolone dual resistance