Table1  Biological characteristics of the cohort of 83 pregnant women. M: mean; SD: standard deviation; BMI: body mass index.

	M ± SD
Age	32.3 ± 0.6
Parity	0.8 ± 0.1
Gestational age	18.6 ± 0.7
Grouping according to trimester
1st trimester	10 women
2nd trimester	64 women
3rd trimester	9 women
Height (cm)	168.3 ± 0.7
Weight before pregnancy (kg)	67.8 ± 1.6
Weight during pregnancy (kg)	75.4 ± 2.0
BMI before pregnancy	23.8 ± 0.5
BMI during pregnancy	26.5 ± 0.6
Weight difference (kg)	6.0 ± 0.5