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Table 3 Effects of a history of prior birth on frequency of susceptible women to rubella according to maternal age

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

  No immunity against rubella (HI <  8×)
Age (year) Overall Primiparous Multiparous P-value
≤ 19 25/126 (19.8%) 23/111 (20.7%) 2/15 (13.3%) 0.7335
20 – 21 29/184 (15.8%) 23/141 (16.3%) 6/43 (14.0%) 0.7102
22 – 23 43/335 (12.8%) 30/236 (12.7%) 13/99 (13.1%) 0.9166
24 – 25 57/642 (8.9%) 37/451 (8.2%) 20/191 (10.5%) 0.3558
26 – 27 101/1171 (8.6%) 72/816 (8.8%) 29/355 (8.2%) 0.7138
28 – 29 100/1768 (5.7%) 69/1132 (6.1%) 31/636 (5.0%) 0.3549
30 – 31 88/2421 (3.6%) 66/1454 (4.5%) 22/967 (2.3%) 0.0036
32 – 33 103/2881 (3.6%) 60/1484 (4.0%) 43/1397 (3.1%) 0.1632
34 – 35 105/3184 (3.4%) 54/1556 (3.5%) 51/1628 (3.3%) 0.7366
36 – 37 134/2990 (4.5%) 79/1389 (5.7%) 55/1601 (3.4%) 0.0030
38 – 39 81/2363 (3.5%) 43/1105 (3.9%) 38/1258 (3.2%) 0.3484
40 – 49 81/2298 (3.5%) 41/1173 (3.4%) 40/1125 (3.6%) 0.8491
Overall 947/20363 (4.7%) 597/11048 (5.4%) 350/9315 (3.8%) < 0.0001
  1. The mean (SD) age was 33.2  ±  5.9 for the 11048 primiparous women and 34.7  ±  5.2 for the 9315 multiparous women (P  <  0.0001).