Table 3.

Mean estimates of the reproduction number (R) and 95 % confidence levels due to respiratory causes^a

	3-day generation interval		4-day generation interval
Wave	Exp. distribution	Delta distribution	Exp. distribution	Delta distribution
1957	1.08 (0.99, 1.17)	1.08 (0.99, 1.18)	1.10 (0.99, 1.23)	1.11 (0.99, 1.24)
1958	1.05 (1.00, 1.11)	1.05 (1.00, 1.11)	1.07 (1.00, 1.14)	1.07 (1.00, 1.15)
1959	1.05 (1.01, 1.08)	1.05 (1.01, 1.08)	1.07 (1.02, 1.11)	1.07 (1.02, 1.12)

^aValues were estimated from weekly data based on three expected pandemic waves: October 1, 1957-March 31, 1958 (1957), October 1, 1958-June 30, 1959 (1958), and October 1, 1959-June 30, 1960 (1959). A generation interval of 3 or 4 days was assumed, with an exponential (exp.) or fixed (delta) distribution