Table 5.

 Logistic regression analysis for percentage of participants achieving serum bactericidal antibody titres ≥1:128 after immunisation with Menjugate at ages 6-7, 8, 9, 10, and 11 years, compared with immunisation at 12-15 years

Age at immunisation (years)	Odds ratio (robust 95% CI)	P value
Overall	–	<0.001
6-7	0.35 (0.16 to 0.73)	0.005
8	0.38 (0.19 to 0.74)	0.005
9	0.34 (0.16 to 0.74)	0.01
10	0.70 (0.41 to 1.20)	0.2
11	0.96 (0.63 to 1.49)	0.9
12-15	Reference	–

*Adjusted for sex, years since immunisation, batch of Menjugate received, and clustering effect of school/campus attended.