| First trimester | Second trimester | Third trimester |
---|---|---|---|
Number | 137 | 152 | 132 |
Age (years) | 30.84 ± 3.19 | 31.04 ± 3.37 | 30.94 ± 4.76 |
Pre-pregnancy BMI (kg/m2) | 21.01 ± 2.19 | 20.28 ± 1.97 | 20.87 ± 1.95 |
Gestational age (weeks) | 6.81 ± 1.11 | 23.30 ± 2.44 | 31.79 ± 0.83 |