Predictors of oxygen weaning
Cox proportional hazards regression models for clinical predictors of oxygen weaning at 3, 6, 9 and 12 months PMA with a priorivariables of GA, BW, pCO2 at term PMA, duration of invasive ventilation, total duration of respiratory support, length of hospital stay and oxygen flow group at discharge are shown in Table 2. The models indicated that shorter length of hospital stay was a statistically significant predictor of faster oxygen weaning at 9 months (HR 0.99, 95% CI 0.98–1.00, p =0.02) and at 12 months PMA (HR 0.99, 95% CI 0.98–1.00, p =0.02) (Table 2). Length of stay was not found to be a significant predictor of oxygen weaning at three months (HR 1.01, 95% CI 0.97-1.05, p =0.65) or six months (HR 0.99, 95% CI 0.97-1.00, p =0.16). GA, BW, pCO2 at term, invasive ventilation duration and total days on respiratory support were not significant predictors of faster oxygen weaning at any time point (Table 2).