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Table 1 The prevalence of HBsAg, anti-HBc and anti-HBs among pregnant women in the different age groups

From: Chronic HBV infection among pregnant women and their infants in Shenyang, China

Age group HBsAg OR anti-HBc OR anti-HBs OR
  Positive Negative   Positive Negative   Positive Negative  
less than 20 years old 2 152 1.0@ 11 143 1.0@ 107 47 1.0@
n=154 (1.30%) (98.70%)   (7.14%) (92.86%)   (69.48%) (30.54%)  
older than 20 years 247 4135 4.54 1334 3048 5.69 2549 1833 0.61
n=4382 (5.64%) (94.36%)   (30.44%) (69.56%)   (58.17%) (41.83%)  
total 249 4287   1345 3191   2656 1880  
n=4536 (5.49%) (94.51%)   (29.65%) (70.35%)   (58.55%) (41.45%)  
X2 4.59   37.61   7.38  
P < 0.05   < 0.01   < 0.05  
  1. @-reference category.