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Table 1 Baseline characteristics of the study populationa

From: Maternal hepatitis B virus carrier status and pregnancy outcomes: a prospective cohort study

Characteristic HBV carriers (n = 513) Controls (n = 20491) P
Maternal age (y) 27.59 ± 4.02 27.03 ± 4.19 0.003
 ≤19 2 239 0.234
 20–34 476 18,974  
 ≥35 (older pregnancy) 35 12,78  
Height (cm) 156.23 ± 8.43 155.81 ± 7.32 0.201
Pre-pregnancy BMI 22.34 ± 5.86 22.02 ± 5.69 0.209
 <18.5 35 1,751 0.396
 18.5–24.9 408 16,137  
 25–29.9 67 2,536  
 ≥30 3 67  
Education
 Primary/under 15 892 0.288
 Middle/High school 171 6,785  
 College/above 327 12,814  
Parity
 0 373 15,524 0.258
 1 126 4,519  
 ≥2 14 448  
Previous abortion
 0 456 18,607 0.385
 1 42 1,329  
 ≥2 15 555  
Previous preterm birth    0.907
 0 504 20,168  
 1 9 320  
 ≥2 0 3  
Plurality
 1 497 20,001 0.288
 ≥2 16 490  
IVF
 No 509 20,344 0.869
 Yes 4 147  
ALT (U/L) 24.75 ± 7.22 22.34 ± 6.49 <0.001
  1. Abbreviations: BMI body mass index, IVF in vitro fertilization
  2. aValues are reported as mean ± SD, compared with t test, or number, compared with χ 2 test, unless otherwise indicated