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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
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