TABLE 2.

Changes in proportion of total IPD cases attributable to common serogroups in the 2001-2002 year and the 2005-2006 year

Serogroup	2001-2002			2005-2006			% Changea
	No. (%) of cases	No. of cases/105 persons	% of IPD incidence	No. of cases	No. of cases/105 persons	% of IPD incidence
4	35	0.69	6.12	50	0.98	7.62	1.50
6	41	0.81	7.17	51	1	7.77	0.60
9	48	0.95	8.39	51	1	7.77	−0.62
14	121	2.39	21.15	97	1.9	14.79	−6.36*
18	19	0.38	3.32	23	0.45	3.51	0.19
19	52	1.03	9.09	41	0.8	6.25	−2.84
23	47	0.93	8.22	38	0.75	5.79	−2.43
1	20	0.39	3.50	105	2.06	16.01	12.51**
7	24	0.47	4.20	26	0.51	3.96	−0.24
3	30	0.59	5.24	37	0.73	5.64	0.40
8	33	0.65	5.77	35	0.69	5.34	−0.43
11	14	0.28	2.45	10	0.2	1.52	−0.93
12	20	0.39	3.50	25	0.49	3.81	0.31
22	21	0.41	3.67	12	0.24	1.83	−1.84

^a**, P < 0.0001; *, P < 0.005.