Table 1 Demographic characteristics of the oligohydramnios and control groups

Age, (years), mean ± SD

28.6 ± 4.4

28.1 ± 4.4

0.15

BMI (kg/m²), mean ± SD

23.7 ± 4.7

23.6 ± 4.7

0.77

Gravidity, median (range)

2 (2–6)

2 (2–11)

0.51

In vitro fertilization, n (%)

5 (2.3%)

174 (3.2%)

0.46

Smoking, n (%)

34 (15.9%)

706 (13.2%)

0.24

Pre gestational DM, n (%)

1 (0.4%)

25 (0.4%)

> 0.99

Chronic hypertension, n (%)

1 (0.4%)

11 (0.2%)

0.37

Mullerian abnormality, n (%)

1 (0.4%)

18 (0.3%)

0.52