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Table 2 Antibacterial treatment measures for both age groups

From: Is antibacterial treatment intensity lower in elderly patients? A retrospective cohort study in a German surgical intensive care unit

Drug class Patients < 80 years Patients ≥ 80 years
Exposed patients Prescriptions Exposed patient days Exposed patients Prescriptions Exposed patient days
All antibacterials 5060 (100%a) 172,963 (100%b) 26,808 (100%a) 725 (100%a) 17,726 (100%b) 2770 (100%a)
All antibacterials except erythromycin 4673 (92.4%) 125,855 (72.8%) 22,597 (84.3%) 680 (93.8%) 14,567 (82.2%) 2477 (89.4%)
Tetracyclines 93 (1.8%) 1098 (0.6%) 631 (2.4%) 6 (0.8%) 67 (0.4%) 37 (1.3%)
Penicillins 1349 (26.7%) 63,655 (36.8%) 5640 (21.0%) 211 (29.1%) 8741 (49.3%) 806 (29.1%)
Cephalosporines 1711 (33.8%) 10,901 (6.3%) 6208 (23.2%) 248 (34.2%) 1041 (5.9%) 689 (24.9%)
Carbapenems 890 (17.6%) 14,973 (8.7%) 5787 (21.6%) 81 (11.2%) 961 (5.4%) 389 (14.0%)
Macrolides 1574 (31.1%) 47,311 (27.4%) 10,366 (38.7%) 168 (23.2%) 3183 (18.0%) 734 (26.5%)
Clarithromycin 34 (0.7%) 203 (0.1%) 124 (0.5%) 7 (1.0%) 24 (0.1%) 17 (0.6%)
Lincosamides 219 (4.3%) 966 (0.6%) 465 (1.7%) 40 (5.5%) 194 (1.1%) 95 (3.4%)
Aminoglycosides 85 (1.7%) 689 (0.4%) 361 (1.3%) 6 (0.8%) 26 (0.1%) 16 (0.6%)
Fluoroquinolones 1474 (29.1%) 13,954 (8.1%) 4950 (18.5%) 198 (27.3%) 1447 (8.2%) 556 (20.1%)
Glycopeptides 88 (1.7%) 473 (0.3%) 297 (1.1%) 9 (1.2%) 28 (0.2%) 17 (0.6%)
Imidazoles 1483 (29.3%) 12,601 (7.3%) 5297 (19.8%) 230 (31.7%) 1762 (9.9%) 768 (27.7%)
Oxazolidinones 493 (9.7%) 5771 (3.3%) 3163 (11.8%) 36 (5.0%) 251 (1.4%) 147 (5.3%)
  1. aSum of proportions of antibacterial classes exceeds 100% as patients could have been exposed to more than one class
  2. bSum of prescriptions is slightly lower than 100% as some rarely used antibacterials were not analysed as separate classes, see methods section for details