Table 4. Antibiotic resistance rate (%) of non-mucoid strains isolated from outpatients according to their age group, for respiratory tract samples.

	Infant and preschool group (N=2,525)	Schoolchildren group (N=156)	Adult group (N=163)	Elderly adult group (N=317)
Penicillin G	0	0	0	0
AC	0	0	0	0
Cefotaxime	0.4	0.6	0.6	0
Ceftriaxone	0.3	0	0	0
Cefepime	0.5	0	1.2	0
Meropenem	1.5	2.6	2.5	1.6
Erythromycin	90.1*	78.8	71.8	80.1
Clarithromycin	77.1*	62.2	60.1	61.2
Clindamycin	50.9*	34.6	35.0	37.9
Tetracycline	86.0*	73.1	69.3	72.2
Chloramphenicol	14.0	12.8	8.6	14.2
Vancomycin	0	0	0	0
Levofloxacin	0.2	0.6	3.1	4.7
Rifampicin	0	0	0	0
TMP/SMX	8.9	5.1	4.9	12.6

^*P<0.01.

Abbreviations: AC, Amoxicillin-clavulanate; TMP/SMX, Trimethoprim-sulfamethoxazole.