Table 1. Estimated selective advantages and initial frequencies for SARS-CoV-2 R1 variant and Alpha and Delta VOC compared with other circulating variants, Japan, July 2021.

Parameter	Estimated values	95% confidence interval
SR.1	0.25	0.25–0.25
SAlpha	0.44	0.44–0.44
SDelta	0.95	0.90–0.99
qR.1	0.0043	0.0041–0.0046
qAlpha	0.0011	0.0010–0.0012
qDelta	0.0029	0.0023–0.0033

s: selective advantage; q: initial relative frequencies.