Statistical Analysis
Data obtained in the study were analysed statistically using SPSS vn.
25.0 software (SPSS Inc., Chicago, IL, USA). Continuous variables with
normal distribution (p>0.05 in Kolmogorov-Smirnov test or
Shapiro-Wilk [n<30]), were reported as mean±standard
deviation (SD) values, and those not showing normal distribution were
stated as median values. Comparisons between groups were made using the
Student’s t-test or the One-way ANOVA test for normally distributed
data, and the Mann Whitney U-test or Kruskal Wallis test were used for
the data not normally distrubited. Since analysis of variance was
significant, comparisons were applied using the Post Hoc test and the
Mann Whitney U-test.
Categorical variables were analyzed between the groups using the Chi
square test. Multiple linear regression analysis was applied to
determine associations between birthweight, gestational age at birth and
other measurements, with birthweight or gestational age at birth as
dependent variables. Correlations between variables were tested with
Spearson’s correlation coefficient. Correlation coefficients were
interpreted as either an excellent relationship r ≥ 0.91; good 0.90 ≥ r
≥0.71; fair 0.70 ≥ r ≥ 0.51; weak 0.50 ≥ r ≥ 0.31; little or none r ≤
0.3.