Table 2.
Characteristics of Infant Antibiotic Use Among Infants Who Had At Least 1 Prescription Fill in the First Year of Life (n = 120 973)
| Characteristic | No. (%) |
|---|---|
| Total no. of antibiotic prescription fills | 349 673 (100.0) |
| No. of antibiotic fills per infanta | 4 (2–5) |
| Age at the first fill, da | 229 (156–296) |
| Spectrum | |
| Broad | 113 282 (32.4) |
| Narrow | 236 391 (67.6) |
| Formulation | |
| Oral | 338 565 (96.8) |
| Parenteral | 11 108 (3.2) |
| Anaerobic coverage | |
| Yes | 291 881 (83.5) |
| No | 57 792 (16.5) |
| Class | |
| Aminoglycoside | 78 (0.0) |
| Carbacephem | 8288 (2.4) |
| Cephalosporin | |
| First-generation | 10 734 (3.1) |
| Second-generation | 29 084 (8.3) |
| Third-generation | 14 976 (4.3) |
| Fourth-generation | 0 (0) |
| Glycopeptide | 18 (0.0) |
| Lincosamide | 470 (0.1) |
| Macrolide | 28 373 (8.1) |
| Penicillin | 238 195 (68.1) |
| Sulfonamide | 19 455 (5.6) |
| Carbapenem | 1 (0.0) |
| Monobactam | 0 (0) |
| Polypeptide | 0 (0) |
| Chloramphenicol | 0 (0) |
| Oxazolidinones | 1 (0.0) |
Data are presented as no. (%) unless otherwise indicated.
aData are expressed as median (interquartile range).