SPSS 14 was used for statistical analysis. In order to confirm normality, Kolmogorov-Smirnov test was used and for the comparison of the quantitative variables with normal distribution (mother's age, father's age, transcutaneous bilirubin, stool frequency and weight) in the two groups, the independent sample t-test was used. For comparing the quantitative variable with non-normal distribution (gestational age, Apgar score), the nonparametric Mann-Whitney test was utilised. To compare ratios of gender and type of delivery in the two groups, chi-squared test was used. Moreover, the repeated
measure analysis of variance (ANOVA) test was used to compare the quantitative variables of stool frequency and
transcutaneous bilirubin in the two groups. P value below 0.05 was considered significant.