Table 6.

 Percentage with serogroup C meningococcal specific serum bactericidal antibody (SBA) titres ≥1:8 and ≥1:128, SBA geometric mean titres (GMT), and IgG geometric mean concentrations (GMCs) of all participants included in immunogenicity analysis (regardless of serogroup C meningococcal vaccine received). Values in parentheses are 95% confidence intervals

	Age band (age at blood sampling)
	11-13 years (n=407)	14-16 years (n=410)	17-20 years (n=170)	All ages (n=987)
SBA ≥1:8 (%)	79.1 (75.1 to 83.0)	87.3 (84.1 to 90.5)	88.2 (83.4 to 93.0)	84.1 (81.6 to 86.3)
SBA ≥1:128 (%)	68.0 (63.3 to 72.6)	75.4 (70.9 to 79.5)	79.4 (72.5 to 85.2)	73.0 (70.2 to 75.8)
SBA GMT	147 (115 to 188)	300 (237 to 380)	360 (252 to 515)	231 (198 to 270)
IgG GMC (μg/ml)	1.2 (1.0 to 1.4)	2.5 (2.1 to 3.0)	3.6 (2.7 to 4.6)	2.0 (1.7 to 2.2)