Table 7 Maternal characteristics of the selected population. Data expressed as the means ± SDs or n (%)

Pregnant women

6476 (16.4%)

32,963 (83.6%)

39,439 (100%)

Haemoglobin (g/L)

102.16 ± 6.64

125.09 ± 9.64

121.32 ± 12.53

Gestation week

22.65 ± 3.61

23.25 ± 3.36

23.17 ± 3.40

Maternal age (years)

29.21 ± 4.48

29.74 ± 4.18

29.66 ± 4.23

Gravidity

1.99 ± 1.21

1.83 ± 1.13

1.86 ± 1.14

Parity

0.86 ± 0.74

0.59 ± 0.67

0.63 ± 0.69

Pre-pregnancy BMI (kg/m²)

20.48 ± 4.51

21.14 ± 4.33

21.04 ± 4.36

Pre-pregnancy height (cm)

160.39 ± 4.92

161.48 ± 4.92

161.30 ± 4.93

Pre-pregnancy weight (kg)

53.96 ± 8.30

55.93 ± 8.89

55.61 ± 8.83