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Table 1 Distributions of anti-rubella antibodies in pregnant women by age

From: Rubella seroprevalence among pregnant women in Beijing, China

  N, % (95% CI)
  N Negative (< 8 IU/ml) equivocal (8- < 11 IU/ml) Positive (≥11 IU/ml) Protective (≥10 IU/ml) P
Total 324 38 (11.7%; 8.7%–15.7%) 19 (5.9%; 3.8%–9.0%) 267 (82.4%; 77.9%–86.1%) 270 (83.3; 78.9%-87.0%)  
Age
 17-26y 94 11 (11.7%; 6.7%-19.6%) 5 (5.3%; 2.3%–11.9%) 78 (83.0%; 74.1%–89.2%) 79 (84.0%; 75.3%–90.1%) 0.83
 27-36y 144 18 (12.5%; 8.1%- 18.9%) 9 (6.3%; 3.3%–11.5%) 117 (81.3%; 74.1%–86.8%) 118 (81.9%; 74.9%–87.4%)  
 37-46y 86 9 (10.5%; 5.6%- 18.7%) 5 (5.8%; 2.5%–12.9%) 72 (83.7%; 74.5%–90.0%) 73 (84.9%; 75.8%–90.9%)