Table 1. Changes in invasive meningococcal disease notification rates by age group, New South Wales, Australia, 1993 to 2002 and 2003 to 2012.

Age group (years)	1993 to 2002			2003 to 2012			Rate ratio (95% confidence interval)	P-value
	n	%	Rate per 100 000	n	%	Rate per 100 000
0–14	978	51.5	74.1	497	45.2	37.04	0.50 (0.45–0.56)	< 0.001
0–4	701	36.9	159.8	371	33.8	82.79	0.52 (0.46–0.59)	< 0.001
5–9	151	8.0	34.1	76	6.9	17.18	0.50 (0.38–0.66)	< 0.001
10–14	126	6.6	28.7	50	4.5	11.08	0.39 (0.28–0.53)	< 0.001
15–24	479	25.3	54.3	267	24.3	28.34	0.52 (0.45–0.61)	< 0.001
25–64	357	18.8	10.8	264	24.0	7.12	0.66 (0.56–0.77)	< 0.001
65 and over	82	4.3	10.2	71	6.5	7.37	0.72 (0.53–0.99)	0.045
Total	1896	100.0	30.0	1099	100.0	15.81	0.53 (0.49–0.57)	< 0.001