Table 1.

Estimates of doubling time during exponential growth phase.

Period used to estimate doubling time	All observed days used (60 days)	Number of recent days used
		7 days	14 days	21 days
	Growth rate = -0.01
0 – 20		2.04 (1.85, 2.33)	3.23 (3.02, 3.52)	4.31 (4.08, 4.63)
0 – 40	7.18 (6.89, 7.54)	2.04 (1.85, 2.32)	3.22 (3.02, 3.52)	4.32 (4.09, 4.63)
0 – 60	9.88 (9.54, 10.30)	2.03 (1.85, 2.32)	3.24 (3.03, 3.53)	4.31 (4.08, 4.63)
	Growth rate = 0.01
0 – 20		1.98 (1.81, 2.25)	3.09 (2.90, 3.35)	4.08 (3.88, 4.34)
0 – 40	6.55 (6.34, 6.82)	1.98 (1.81, 2.25)	3.09 (2.91, 3.35)	4.08 (3.88, 4.34)
0 – 60	8.74 (8.51, 9.01)	1.99 (1.81, 2.25)	3.10 (2.91, 3.35)	4.08 (3.88, 4.34)
	Growth rate = 0.1
0 – 20		1.76 (1.63, 1.94)	2.55 (2.44, 2.69)	3.15 (3.06, 3.26)
0 – 40	4.27 (4.22, 4.32)	1.76 (1.63, 1.94)	2.55 (2.45, 2.69)	3.15 (3.06, 3.26)
0 – 60	4.91 (4.88, 4.93)	1.76 (1.63, 1.94)	2.55 (2.45, 2.69)	3.15 (3.06, 3.26)

Numbers in parenthesis represent 95% confidence intervals as computed via the profile likelihood method. During the maximum likelihood estimation, daily cases were assumed to follow Gaussian distribution.