Statistical analysis
The collected data was coded and entered to the Statistical Package for
Social Science (IBM- SPSS v.25, SPSS Inc) for analysis. The variables
listed were analysed and compared between the groups. The quantitative
data were presented as mean and standard deviation when their
distribution is parametric and as median and range when their
distribution is nonparametric. Qualitative variables were presented as
number, percentages, or proportions. The confidence interval was set to
95% and the margin of error accepted was set to 5%. P-value was
considered significant if P ≤ 0.05. Appropriate statistical tests were
used to compare the variables. The confidence interval was set to 95%
and P-value considered significant if P ≤ 0.05. Subgroup analysis was
done for gestation >28 weeks and between surfactant types
(Curosurf, Survanta, Neosurf)