Overall, 9.4% of women were susceptible to rubella, 16.5% to rubeola and 16.3% to mumps.
A total of 32.6% of women were susceptible to at least one virus. Only 1.7% of women were not immune to all three: 51.6% of women who were susceptible to rubella were also susceptible to either rubeola or mumps, whereas 25.6% of women who were immune to rubella were susceptible to either rubeola or mumps.
A logistic regression model was used to assess for predictors of immunity to all three viruses and also to predict booster status.
The analysis showed that in a cohort of 1,000 women:
strategy A would not immunise 280 women who were susceptible to a virus;
strategy B, would not immunise 232 women who were immune to rubella but susceptible to either rubeola or mumps; and
strategies C and D would immunise all women who were susceptible to any of the three viruses.