Table 1

Severity-based criteria for diagnosis of CLD at 36 weeks post-menstrual age

Received respiratory support and/or supplementary oxygen for more than 28 days, cumulatively, and the following:
Mild CLD
  • Breathing room air

Moderate CLD
  • Require <30% oxygen (or low flow 0.01 to 1.0 L/min), not receiving any respiratory support

Severe CLD
  • Require ≥30% oxygen (or low flow ≥1.1 L/min), still receiving respiratory support (ventilation, CPAP, high-flow oxygen)

  • CLD, chronic lung disease of prematurity; CPAP, continuous positive airway pressure.