Evaluation of the study sample
In the baseline characteristics, the sample collected in the year 2018 and 2020 differed statistically significantly in age (mean 31.2 vs. 31.7 years), body mass index (BMI) (25.06 vs. 25.41), and mode of delivery (Table Baseline characteristics of women giving birth in 2018 or 2020 (after exclusion criteria)In 2020, there were more caesarean sections (planned and unplanned) and more instrumental vaginal deliveries. The samples did not differ in the other baseline data regarding primiparous, multiparous and gestational age.