Table 4.

Age contribution of cases in the periods 1997–98 and 2000–02 (both sexes)

	1997–1998		2000–2002
Age groups	Cumulative frequency	Cumulative percent (%)	Cumulative frequency	Cumulative percent (%)
0–9	6	5	1	3
0–19	17	14	3	10
0–29	35	28	7	23
0–39	49	40	9	30
0–49	67	54	17	57
0–59	84	68	21	70
0–69	105	85	25	83
0–80	123	100	30	100
p >0.05 (Kolmogorov-Smirnov test)

* Poisson regression ** before vaccination *** after vaccination