Statistical Analysis
Patient cohort was divided into two groups according to their weight at
the time of surgery: Group 1 < 1000 g and Group 2 ≥ 1000 g.
The SPSS statistical programme for Windows, version 22 (SPSS, Inc.,
Chicago, IL, United States of America) was used for data analysis. The
Shapiro–Wilk test was used for the analysis of compliance with normal
distribution. Normally distributed continuous data are presented as a
mean ± standard deviation together with its ranges in brackets and
nominal variables are presented as counts and/or percentages.
Non-normally distributed continuous data are presented as a mean ±
standard deviation and the median parameters with their interquartile
ranges in brackets. For statistical comparison of group data, Student’s
t-test was used for normally distributed continuous variables and
Mann–Whitney U-test for non-normally distributed continuous variables.
Complication and death incidences for both groups were tested for
significance using the Ki-Kare ve Fisher’s exact test. All statistical
tests were two-sided. A p-value of < 0.05 was considered
statistically significant