Fig. 4

Correlation between mLUS score and short-term outcomes described as continuous variables. Panel A, B and C represent duration of mechanical ventilation, duration of supplemental oxygen and length of hospital stay, respectively. The mLUS score is significantly correlated with duration of mechanical ventilation (P = 0.002), duration of supplemental oxygen (P < 0.001) and length of hospital stay (P < 0.001) adjusted for gestational age. Hatched blue curves represent the best fitting data lines and are all generated by local regression smoothing procedure. Table shows Spearman correlation coefficients and results of multivariate linear regressions adjusted for gestational age. mLUS score: modified lung ultrasound score; r: Spearman correlation coefficient; β: adjusted linear regression coefficient