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

Table 2 Temporal epidemic indices summary table

Climate zone	Cumulative weeks (CW)	Total study weeks (TW)	Prevalent waves (PV)	Average incidence rate (IR)	Duration Index	Frequency Index	Intensity Index
Am	115	262	6	0.43	0.44	19.17	0.07
Aw	262	262	12	0.53	1.00	21.83	0.04
BWk	262	262	15	0.24	1.00	17.47	0.02
BSk	262	262	9	0.60	1.00	29.11	0.07
Cwa	262	262	9	0.87	1.00	29.11	0.10
Cwb	262	262	15	0.25	1.00	17.47	0.02
Cfa	262	262	9	1.30	1.00	29.11	0.14
Dwa	262	262	7	0.60	1.00	37.43	0.09
Dwb	262	262	5	0.39	1.00	52.40	0.08
Dwc	258	262	10	0.40	0.98	25.80	0.04
ET	239	262	4	0.45	0.91	59.75	0.11

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

ISSN: 2049-9957