Table 1

Number of cases (n), incidence rates per 100 000 person-years (IR) and mean annual relative change in incidence of bacterial meningitis, according to age group (years), Finland, 1995–2014

	1995–1999		2000–2004		2005–2009		2010–2014		1995–2014		1995–2014
	n	IR	n	IR	n	IR	n	IR	n	IR	% change*	95% CI
Streptococcus pneumoniae
<2	26	4.32	25	4.43	18	3.05	14	2.33	83	3.52	−4	−7 to 0
2–4	6	0.63	3	0.35	6	0.69	3	0.33	18	0.50	−1	−8 to 7
5–17	13	0.31	11	0.26	7	0.17	2	0.05	33	0.20	−7	−13 to 1
18–49	59	0.50	54	0.48	35	0.32	30	0.27	178	0.40	−4	−6 to 1
50–64	41	0.91	52	1.00	56	0.99	37	0.65	186	0.88	−2	−4 to 1
≥65	25	0.67	23	0.57	39	0.89	26	0.51	113	0.66	−1	−4 to 2
All age groups	170	0.55	168	0.65	161	0.61	112	0.41	611	0.58	−2	−4 to 1
Neisseria meningitidis
<2	23	3.83	23	4.07	8	1.36	14	2.33	68	2.89	−4	−8 to 0
2–4	19	1.98	11	1.27	12	1.38	6	0.66	48	1.33	−6	−10 to −1
5–17	37	0.88	16	0.38	24	0.60	7	0.18	84	0.52	−8	−14 to −3
18–49	93	0.79	46	0.41	42	0.38	14	0.13	195	0.43	−10	−13 to −8
50–64	15	0.33	15	0.29	7	0.12	2	0.04	39	0.18	−12	−17 to −6
≥65	6	0.16	3	0.07	4	0.09	3	0.06	16	0.09	−7	−14 to 2
All age groups	193	0.62	114	0.44	97	0.37	46	0.17	450	0.43	−9	−10 to −7
Haemophilus influenzae
<2	4	0.67	3	0.53	2	0.34	1	0.17	10	0.42	−7	−17 to 4
2–4	0	0.00	3	0.35	0	0.00	0	0.00	3	0.08	NA	NA
5–17	5	0.12	4	0.10	0	0.00	2	0.05	11	0.07	−8	−17 to 3
18–49	4	0.03	2	0.02	2	0.02	6	0.05	14	0.03	5	−5 to 15
50–64	3	0.07	3	0.06	2	0.04	2	0.04	10	0.05	−3	−13 to 8
≥65	2	0.05	0	0.00	7	0.16	1	0.02	10	0.06	1	−9 to 12
All age groups	18	0.06	15	0.06	13	0.05	12	0.04	58	0.06	−2	−7 to 2
S. agalactiae
<2	25	4.16	24	4.25	32	5.43	25	4.16	106	4.50	0	−3 to 5
2–4	1	0.10	0	0.00	0	0.00	0	0.00	1	0.03	NA	NA
5–17	0	0.00	1	0.02	0	0.00	0	0.00	1	0.01	NA	NA
18–49	2	0.02	1	0.01	1	0.01	2	0.02	6	0.01	1	−12 to 16
50–64	4	0.09	2	0.04	7	0.12	3	0.05	16	0.08	1	−9 to 8
≥65	0	0.00	7	0.17	1	0.02	3	0.06	11	0.06	−2	−11 to 9
All age groups	32	0.10	35	0.13	41	0.15	33	0.12	141	0.13	0	−3 to 3
Listeria monocytogenes
<2	1	0.17	0	0.00	0	0.00	0	0.00	1	0.04	NA	NA
2–4	0	0.00	0	0.00	0	0.00	0	0.00	0	0.00	NA	NA
5–17	1	0.02	0	0.00	0	0.00	0	0.00	1	0.01	NA	NA
18–49	9	0.08	3	0.03	0	0.00	3	0.03	15	0.03	−11	−19 to −3
50–64	10	0.22	3	0.06	6	0.11	4	0.07	23	0.11	−6	−13 to 1
≥65	14	0.37	13	0.32	13	0.30	21	0.42	61	0.35	0	−4 to 4
All age groups	35	0.11	19	0.07	19	0.07	28	0.10	101	0.10	−2	−5 to 1
Total bacterial meningitis
<2	79	13.14	75	13.28	60	10.18	54	8.99	268	11.38	−2	−4 to 1
2–4	26	2.71	17	1.97	18	2.07	9	0.98	70	1.94	−5	−10 to 0
5–17	56	1.33	32	0.77	31	0.77	11	0.28	130	0.80	−8	−12 to −4
18–49	167	1.43	106	0.94	80	0.73	55	0.50	408	0.91	−7	−8 to −5
50–64	73	1.63	75	1.44	78	1.37	48	0.84	274	1.30	−4	−6 to −2
≥65	47	1.25	46	1.15	64	1.46	54	1.07	211	1.23	−1	−4 to 1
All age groups	448	1.45	351	1.35	331	1.25	231	0.85	1361	1.29	−4	−3 to −5

*Mean annual relative change in incidence calculated by Poisson regression or negative binomial regression.
NA, not applicable.