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

30.9  ±  5.3

7.0 (57/816)

32.4  ±  4.9

3.3 (21/634)*

28.2  ±  4.8

4.8 (20/416)

34.3  ±  4.3*

3.4 (13/387)

30.4  ±  7.7

3.7 (46/1252)

33.0  ±  6.6

3.3 (40/1215)

33.2  ±  5.9

4.3 (181/4241)

34.2  ±  5.7

2.5 (76/3088)*

29.5  ±  5.6

6.4 (132/2070)

33.4  ±  6.4*

6.2 (98/1572)

30.2  ±  7.5

7.1 (161/2253)

32.8  ±  6.7*

4.2 (102/2419)*

33.2 ±  5.9

5.4 (597/11048)

34.7 ±  5.2*

3.8 (350/9315)*