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Table 1 Characteristics of the included and excluded pregnant women

From: Concentrations of perfluoroalkyl and polyfluoroalkyl substances and blood glucose in pregnant women

Characteristics Included (N = 856)
N (%) / Mean ± SD
Excluded (N = 369)
N (%) / Mean ± SD
P-value of Student’s t-test or Chi-square test
Maternal age at enrollment (years)
 Mean ± SD 27.8 ± 3.3 27.8 ± 3.4 0.784
  < 25 128 (15.0) 56 (15.2) 0.454
 25–35 697 (81.4) 294 (79.7)  
  ≥ 35 31 (3.6) 19 (5.1)  
Pre-pregnancy BMI (kg/m2)
 Mean ± SD 20.4 ± 2.4 20.5 ± 2.4 0.732
  < 18.5 176 (20.9) 68 (18.7) 0.666
 18.5–24.9 627 (74.6) 279 (76.6)  
  ≥ 25 37 (4.4) 17 (4.7)  
Maternal education
 Below high school 76 (8.9) 43 (11.7) 0.314
 High School 125 (14.6) 50 (13.5)  
 College or above 653 (76.5) 276 (74.8)  
Per capita household income (CNY)
  < 4000 176 (21.0) 57 (16.2) 0.151
 4000–8000 495 (59.1) 224 (63.8)  
  > 8000 167 (19.9) 70 (19.9)  
Passive smoking
 Yes 295 (40.4) 109 (43.9) 0.320
 No 436 (59.6) 139 (56.1)  
Pregnancy complication
 Yes 53 (6.19) 22 (6.0) 0.878
 No 803 (93.8) 347 (90.0)  
History of abortion and stillbirth
 Yes 320 (37.4) 147 (39.8) 0.271
 No 536 (62.6) 222 (60.2)  
Parity
 0 732 (86.1) 296 (80.8) 0.020
  ≥ 1 118 (13.9) 70 (19.1)  
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