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Prevalence of selected outcomes in each hospital system.
| Outcome | Hospital A (N=5775), n (%) | Hospital B (N=15,434), n (%) | P value |
| Surgical site infection | 291 (5) | 761 (4.9) | .77 |
| Pneumonia | 44 (0.8) | 171 (1.1) | .03a |
| Sepsis | 175 (3) | 400 (2.6) | .09 |
| Urinary tract infection | 50 (0.9) | 125 (0.8) | .75 |
aPneumonia was significantly more prevalent in Hospital B (P<.05).
