Table 1: Selected clinical characteristics and demographics of the study population. Numbers are percentages or means (min, max).


Streptococcus G or CStreptococcus BNegative-value
Mothers
Infants
Variables

Age, years, mean (min, max)30.3 (19,44)30.3 (18,44)30.2 (19,44)0.973
BMI, median, kg/m2 (min, max)23.5 (16,48)23.5 (16,56)22.9 (16,51)0.114
BMI 3016.218.618.10.051
Nulliparous42.041.340.60.920
Current smoker14.715.617.00.659
Caucasian98.696.797.10.170
Gestational diabetes16.719.217.80.496
Caesarean delivery11.416.412.40.086
Anaemia4.34.84.30.928
Antibiotic treatment during delivery35.692.420.4<0.001
Blood loss 1000 ml5.96.97.40.675
Gestational age ≤ 37 weeks4.82.95.70.115
Gestational age ≥ 42 weeks6.23.12.10.007
Apgar score 1 min < 30.51.20.90.527
Apgar score 5 min < 71.61.92.30.795

BMI = body mass index (calculated as persons weight in kilograms divided by square of height in meters). Including prophylactic antibiotics for Streptococcus B colonization, treatment for suspected chorioamnionitis, and prophylactic antibiotics during cesarean section. Age and BMI were compared between three groups using ANOVA or the Kruskall-Wallis test and the other variables with chi-squared test or Fisher’s exact test.