| AHRQ | Agency for Healthcare Research and Quality |
| HCUP | Healthcare Cost and Utilization Project |
| UPI | unplanned endotracheal tube intubation |
| KID | Kids’ Inpatient Databases |
| PDI09 | Postoperative Respiratory Failure indicator |
| PDI | Pediatric Quality Indicator |
| PCLASS_ORPROC | Procedure Classes Refined for ICD-10-PCS |
| PORF | Post Operative Respiratory Failure |
| MDCs | Major Diagnostic Categories |
| DRG | Diagnosis-Related Group |
| QI | Quality Improvement |
| ICD | International Classification of Diseases |
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