Table 1 Clinical characteristics of patient samples.

Maternal characteristics

Gestational age (weeks)^a

34.4 ± 6.5

35.8 ± 6.6

p = 0.25

Maternal age (years)^a

33.2 ± 5.7

31.9 ± 6.5

p = 0.4

Placental weight (g)^a

409.3 ± 110.3

525.0 ± 148.2

p < 0.005

Parity^b

Primiparous

12

10

p = 0.56

Multiparous

13

15

Mode of delivery^b

Vaginal

10

6

p = 0.35

Cesarean section in labor

3

2

Cesarean section not in labor

12

17

New born characteristics

Gender^b

Male

8

12

p = 0.25

Female

17

13

Birth weight

Weight (g)^a

2,051.4 ± 637.0

2,603.8 ± 857.0

p < 0.05

10th–90th percentile

0

25

5th–10th percentile

11

<5th percentile

14