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Table 2 Effects of a history of prior birth on frequency of susceptible women to rubella according to area

From: Effects of campaign for postpartum vaccination on seronegative rate against rubella among Japanese women

  Primiparous Multiparous
Area Age (years) % (a/b)† Age (years) % (a/b)†
A 30.9  ±  5.3 7.0 (57/816) 32.4  ±  4.9 3.3 (21/634)*
B 28.2  ±  4.8 4.8 (20/416) 34.3  ±  4.3* 3.4 (13/387)
C 30.4  ±  7.7 3.7 (46/1252) 33.0  ±  6.6 3.3 (40/1215)
D 33.2  ±  5.9 4.3 (181/4241) 34.2  ±  5.7 2.5 (76/3088)*
E 29.5  ±  5.6 6.4 (132/2070) 33.4  ±  6.4* 6.2 (98/1572)
F 30.2  ±  7.5 7.1 (161/2253) 32.8  ±  6.7* 4.2 (102/2419)*
Overall 33.2 ±  5.9 5.4 (597/11048) 34.7 ±  5.2* 3.8 (350/9315)*
  1. (a/b)†, number of women with HI titer <  8×/total number of women; *, P  <  0.05 vs. corresponding counterpart.