Inpatient charges and reimbursements between PA and non-PA patient populations.
| Factor | PA, Mean ± SD | No PA, Mean ± SD | Risk-Adjusted Marginal Cost (Ref: No PA) | P Value |
| Inpatient charges | $87,565 ± $53,290 | $81,385 ± $51,222 | +$4340 (SE: 583) | <0.001 |
| Inpatient reimbursements | $22,891 ± $8931 | $21,587 ± $8827 | $1221 (SE: 100) | <0.001 |
Abbreviations: PA, penicillin allergy; SE, standard error.
Note: Boldface indicates statistically significant findings.