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Table 1 Characteristics of study popluation

From: Maternal fat free mass during pregnancy is associated with birth weight

N

1150

Maternal age (year)

28.0 (20.0–44.0)

Primiparous (%)

74.2

urban residents (%)

92.1

Pre-pregnancy weight (kg)

53.8 (37.1.–91.0)

Height (cm)

160.3 (143.0–178.9)

Pre-pregnancy BMI (kg m-2)

21.0 (15.4–32.8)

 Underweight (less than 18.5, %)

13.5

 Normal (18.5–22.9, %)

64.6

 Overweight (23.0–24.9, %)

12.3

 Obese (25.0 or higher, %)

9.6

During pregnancy

 Maternal weight gain (kg)

17.3 (9.1–38.8)

 Placental weight (g)

625.1 (50.0–1000.0)

 Fat mass (kg)

18.5 (8.7–54.4)

 Fat-free mass (kg)

38.6 (28.9–51.2)

 Fat-free mass index

15.2 (12.1–33.0)

 Gestational age at delivery (weeks)

39.1 (36.5–42.0)

Mode of delivery

 Spontaneous vaginal delivery (%)

53.4

 Instrumental (%)

9.2

 Cesarean delivery (%)

37.4

Birth weight (g)

3370.0 (2500.0–4600.0)

Birth length (cm)

51.2 (47.0–53.9)

Neonatal male sex (%)

49.8