Table 1.

The parameters of the logistic model fitting results of varicella epidemic in summer–autumn and winter–spring between 2008 and 2017 in Changsha

Time	Parameter k	Parameter N	Parameter c
Summer–autumn
2008	0.346	2162	−4.68
2009	0.317	2002	−4.07
2010	0.309	2415	−4.47
2011	0.304	3235	−4.16
2012	0.311	2776	−4.18
2013	0.271	2518	−3.83
2014	0.262	2510	−4.06
2015	0.290	2697	−3.84
2016	0.318	2399	−4.05
2017	0.336	4880	−4.37
Winter–spring
2008	0.341	1642	−4.08
2009	0.299	1291	−3.82
2010	0.423	2522	−4.55
2011	0.338	2858	−3.92
2012	0.351	3179	−4.34
2013	0.362	2804	−4.13
2014	0.370	4348	−4.98
2015	0.384	3425	−4.85
2016	0.415	3934	−4.49
2017	0.356	3679	−3.94