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Table 2 Distributions of anti-rubella antibodies in pregnant women by gravidity and parity

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
Gravidity
 One 128 16 (12.5%; 7.8%–19.3%) 8 (6.3%; 3.2%–11.8%) 104 (81.3%; 73.6%–87.1%) 106 (82.8%; 75.3%–88.4%) 0.84
 More than one 196 22 (11.2%; 7.5%–16.4%) 11 (5.6%; 3.2%–9.8%) 163 (83.2%; 77.3%–87.8%) 164 (83.7%; 77.9%–88.2%)  
Parity
 One 194 22 (11.3%; 7.6%–16.6%) 13 (6.7%; 4.0%–11.1%) 159 (82.0%; 75.9%–86.7%) 161 (83.0%; 77.1%–87.6%) 0.84
 More than one 130 16 (12.3%; 7.7%–19.1%) 6 (4.6%; 2.1%–9.7%) 108 (83.1%; 75.7%–88.6%) 109 (83.8%; 76.6%–89.2%)