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Table 1 Distributions of selected characteristics of the study population

From: Maternal exposure to ambient fine particulate matter and fetal growth in Shanghai, China

Characteristics

N (%)

Maternal age (years)

 22–28

2783 (34.9)

 29–35

4516 (56.7)

  > 35

666 (8.36)

Registered residence (missing = 1)

 Permanent

4755 (59.7)

 Migrant

3209 (40.3)

Parity (missing = 1)

 1

6405 (80.4)

 2

1559 (19.6)

Gravidity (missing = 6)

 1

5076 (63. 8)

  ≥ 2

2883 (36.2)

SMIa (missing = 28)

 No

2448 (30.8)

 Yes

5489 (69.2)

GHb

 No

7567 (95.0)

 Yes

398 (5.0)

GDMc

 No

6771 (85.0)

 Yes

1194 (15.0)

BMI (pre-pregnancy)

 Under weight

573 (7.2)

 Normal weight

6129 (77.0)

 Overweight

1062 (13.3)

 Obesity

201 (2.5)

Height (mean ± sd)/cm

161.67 ± 4.44

Weight (pre-pregnancy) (mean ± sd)/kg

57.11 ± 11.99

Newborn gender

 Male

4045 (50. 8)

 Female

3920 (49.2)

Season of conception

 Spring

2216 (27.8)

 Summer

1839 (23.1)

 Autumn

1756 (22.1)

 Winter

2154 (27.0)

PTBd

 No

7586 (95.2)

 Yes

379 (4.8)

LBWe

 No

7732 (97.1)

 Yes

233 (2.9)

  1. aStaff Medical Insurance; bGestational Hypertension; cGestational Diabetes Mellitus; dPreterm Birth; eLow Birth Weight