| aRR | Adjusted risk ratio |
| CI | Confidence interval |
| NICU | Neonatal intensive care unit |
| NOS | Newcastle–Ottawa Scale |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| PVC | Premature ventricular contraction |
| QUIPS | Quality In Prognosis Studies |
| RR | Risk ratio |
| SGA | Small for gestational age |
| SVT | Supraventricular tachycardia |
| US | United States |
| VT | Ventricular tachycardia |
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