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No. of antibiotic exposures during the first year of infants’ lives and the number of β-lactamase-producing species at 12 months
| No. of antibiotic exposures | No. of infants with the following no. of β+ species at 12 moa
|
||||
|---|---|---|---|---|---|
| 0 | 1 | 2 | ≥3 | Total | |
| 0 | 2 | 5 | 6 | 0 | 13 |
| 1 | 2 | 2 | 2 | 3 | 9 |
| 2 | 0 | 3 | 3 | 2 | 8 |
| ≥3 | 1 | 2 | 5 | 6 | 14 |
| Total | 5 | 12 | 16 | 11 | 44 |
Mantel-Haenzel chi-square value = 5.18; P = 0.023; r = 0.347. β+, β-lactamase producing.
