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Table 1 Severity-based diagnostic criteria for BPD

From: Baby-OSCAR: Outcome after Selective early treatment for Closure of patent ductus ARteriosus in preterm babies—a statistical analysis plan for short-term outcomes

Time point of assessment: 36 weeks of postmenstrual age
Therapy with oxygen >  21% and/or respiratory support for ≥ 28 days and the following:
 Mild BPD Baby is breathing room air
 Moderate BPD Baby is in 22–29% oxygen or 0.01–1.0 L/min
 Severe BPD FiO2 ≥ 0.3, or low flow oxygen ≥ 1.1 L/min, or the baby is receiving any respiratory support (ventilation, CPAP, or high flow oxygen therapy) to achieve saturations of ≥ 91%