Table 1 Baseline characteristics of the included patientsa
|  | HBV-positive (n = 9699) | HBV-negative (n = 73076) | P value | OR |
|---|---|---|---|---|
Maternal age (yrs, mean ± SD) | 30.33 ± 4.50 | 30.28 ± 4.45 | P = 0.30 |  |
Gestational age (weeks, mean ± SD) | 38.18 ± 2.96 | 38.17 ± 3.51 | P = 0.76 |  |
Gravidity | ||||
 1 | 3323 (34.26%) | 28,076 (38.42%) | P < 0.001 | 0.84 (0.80,0.87) |
  > 1 | 6376 (65.74%) | 45,000 (61.58%) | P < 0.001 | 1.20 (1.15,1.25) |
Parity | ||||
 1 | 82 (0.85%) | 760 (1.04%) | P = 0.07 | 0.81 (0.65,1.02) |
  > 1 | 9617 (99.15%) | 72,316 (98.96%) | P = 0.07 | 1.23 (0.98,1.55) |
Mode of delivery | ||||
 Instrumental vaginal | 1903 (19.62%) | 14,009 (19.17%) | P = 0.29 | 1.03 (0.98,1.09) |
 Cesarean section | 3380 (34.85%) | 24,729 (33.84%) | P = 0.05 | 1.05 (1.00,1.09) |
 Vaginal delivery | 4373 (45.09%) | 33,907 (46.40%) | P = 0.01 | 0.95 (0.91,0.99) |
 Regional analgesia | 43 (0.44%) | 431 (0.59%) | P = 0.07 | 0.75 (0.55,1.03) |
Birth weight(g) | ||||
  < 3000 | 2855 (29.44%) | 20,571 (28.15%) | P = 0.008 | 1.06 (1.02,1.122) |
 3000–3499 | 4026 (41.51%) | 30,721 (42.04%) | P = 0.32 | 0.98 (0.94,1.02) |
 3500–3999 | 2231 (23.00%) | 17,085 (23.38%) | P = 0.41 | 0.98 (0.93,1.03) |
  ≥ 4000 | 388 (6.05%) | 2718 (6.43%) | P = 0.17 | 1.08 (0.97,1.20) |