Table 2. Reported age-specific clinical attack rates (%) for different scenarios.

Scenario	Attack rates by age class, y
	<4	5–14	15–64	>65
Baseline (uniform attack rates)	25	25	25	25
1957 (26)	26	42	22	10
1968 (27)	16	11	49	24
1918 1st wave (28)	16	32	43	9
1918 2nd wave (28)	27	31	29	14
1918 3rd wave (28)	24	22	29	24