Newborns with pneumothorax (case group) were compared to those without pneumothorax
(control group) in many different aspects. Univariate analysis showed significant difference
for some factors which are listed in Table 2. Multivariate regression logistic (Backward
Stepwise) after 6 steps revealed that surfactant replacement therapy was the only significant
factor between case and control groups (P=0.017)(Table 3).