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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).