Table 2.

Comparison of observed value of $R_t$ and predicted values obtained from exponential trend equation models during two COVID-19 outbreaks in Dalian

Date	Predicted values	Observed value	95%CI	Relative error (%)
In the COVID-19 outbreak during July 22 to August 5, 2020
2020/7/29	1.629	1.499	1.076–1.992	8.672
2020/7/30	1.388	1.601	1.185–2.080	− 13.304
2020/7/31	1.183	1.461	1.081–1.898	− 19.028
2020/8/1	1.008	1.221	0.887–1.608	− 17.445
2020/8/2	0.859	1.073	0.770–1.425	− 19.944
In the COVID-19 outbreak during March 14 to April 2, 2022
2022/3/18	7.318	6.984	6.286–7.719	4.783
2022/3/19	5.654	5.332	4.833–5.854	6.037
2022/3/20	4.368	3.883	3.525–4.257	12.495
2022/3/21	3.375	2.993	2.723–3.277	12.758
2022/3/22	2.607	2.187	1.983–2.401	19.222
2022/3/23	2.014	1.605	1.447–1.771	25.511
2022/3/24	1.556	1.232	1.105–1.367	26.328
2022/3/25	1.202	0.957	0.851–1.068	25.646
2022/3/26	0.929	0.712	0.625–0.805	30.477