Table 1 Distribution of BD cases in Yangtze River basin during 2005–2020
Characteristic | Yangtze River basin (95 cities) | Upper reaches (39 cities) | Middle and lower reaches (56 cities) |
|---|---|---|---|
Total Cases (n, %) | 1,037,150 | 489,397 | 547,753 |
Age | |||
≤ 5 | 364,843(35.2) | 179,979(36.8) | 184,864(33.8) |
6–17 | 116,365(11.2) | 58,120 (11.9) | 58,245(10.6) |
18–59 | 455,075(43.9) | 206,337(42.1) | 248,738(45.4) |
≥ 60 | 100,867(9.7) | 44,961(9.2) | 55,906(10.2) |
Season | |||
Spring | 226,156(21.8) | 116,208(23.8) | 109,948(20.1) |
Summer | 381,426(36.7) | 177,489(36.3) | 203,937(37.2) |
Fall | 297,327(28.7) | 130,497(26.6) | 166,830(30.5) |
Winter | 132,241(12.8) | 65,203(13.3) | 67,038(12.2) |
ENSO phase | |||
Normal | 540,547(52.1) | 253,349(51.8) | 287,198(52.4) |
El Niño | 137,704(13.3) | 68,352(14.0) | 69,352(12.7) |
La Niña | 358,899(34.6) | 167,696(34.2) | 191,203(34.9) |