Epidemiological features of seasonal influenza transmission among 11 climate zones in Chinese Mainland

Table 1 Descriptive analysis on climate zones

Climate zones	Mean weekly incidence rate (per 100,000 people)	Peak mean incidence rate (per 100,000 people)	Mean weekly cases number	Peak mean cases number	2019 Population proportion (%)	Counties number	Area (km²)	Area proportion (%)
Am	1.189	13.123	10.951	60.8	–	1	–	–
Aw	1.654	4.625	74.007	266	0.553	22	37,299	0.41
BWk	0.254	1.519	98.527	402.6	2.147	129	2,069,295	22.54
BSk	0.678	3.172	759.069	2938.8	8.327	277	912,696	9.94
Cwa	1.053	5.601	4502.427	18,580	25.345	551	1,024,624	11.16
Cwb	0.319	1.215	102.227	395.6	3.354	108	308,582	3.36
Cfa	1.407	9.385	5381.338	23,260.8	31.623	781	1,245,406	13.57
Dwa	0.675	3.701	2888.031	14,368.8	24.630	652	992,893	10.82
Dwb	0.455	2.043	182.285	577.6	3.068	181	683,447	7.45
Dwc	0.427	2.980	17.888	81.6	0.427	34	310,456	3.38
ET	0.762	5.212	8.4	46.6	0.522	114	1,594,138	17.37

Am: Tropical, monsoon, Aw: Tropical, savannah, BWk: Arid, desert, cold, BSk: Arid, steppe, cold, Cwa: Temperate, dry winter, hot summer, Cwb: Temperate, dry winter, warm summer, Cfa: Temperate, no dry season, hot summer, Dwa: Continental, dry winter, hot summer, Dwb: Continental, dry winter, warm summer, Dwc: Continental, dry winter, cold summer, ET: Polar, tundra, –: Not applicable

ISSN: 2049-9957