Table 3.

Incidence rates of meningococcal disease by serogroup in the city of Salvador and in the state of Bahia (without Salvador), Brazil, in pre- and post-vaccine periods, 2007–2015.

	Salvador					Bahia (without Salvador)
Age group (years)	Pre-vaccine period Rateα	Post-vaccine period Rateα	RR*	(95% CI)†	p value	Pre-vaccine period Rateα	Post-vaccine period Rateα	RR*	(95% CI)†	p value
0-4	5.45	0.73	0.11	(0.04-0.28)	<0.0001	0.78	0.24	0.30	(0.15-0.63)	0.001
5-9	3.91	1.11	0.28	(0.13-0.58)	0.006	0.48	0.27	0.57	(0.21-1.13)	0.116
10-19	3.05	0.70	0.23	(0.12-0.40)	0.006	0.55	0.42	0.76	(0.51-1.14)	0.203
20-39	1.92	0.78	0.39	(0.27-0.58)	0.001	0.23	0.19	0.84	(0.53-1.34)	0.480
≥ 40	1.01	0.45	0.44	(0.25-0.76)	0.004	0.15	0.11	0.76	(0.41-1.40)	0.389

^*Relative risk;

^†Confidence interval;

^α2007-2010;

^β2011-2015;

^πAverage annual incidence rate per 100,000 population.