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Table 1 Background characteristics of the seven provincial-level administrative divisions in region 1 and region 2 during 2010–2019

From: Increased urbanization reduced the effectiveness of school closures on seasonal influenza epidemics in China

  Region 1 Region 2
Hebei Tianjin Beijing Shanghai Zhejiang Jiangsu Anhui
Cities (hospitals)a 10 (24) 1 (10) 1 (11) 1 (19) 12 (16) 13 (29) 17 (25)
Population size (million)b 74.25 15.47 21.71 24.15 55.39 79.76 55.39
Latitude (°N) 38.1 39.2 39.9 31.3 30 32.9 31.8
Longitude (°E) 115.8 117.2 116.4 121.5 120.4 118.6 117.5
Mean winter temperature (°C) 1.2 3.5 1.8 10.5 11.3 8.2 8.6
Mean winter relative humidity (%) 54.6 54.4 49.9 69.5 74.1 71.8 70.4
Urbanization ratec 49.3% 82.3% 86.5% 87.6% 67.0% 67.7% 50.5%
  1. aNumber of cities and hospitals in the surveillance
  2. bPopulation size in millions in 2015 [9]
  3. cUrbanization rate in 2015 [9]