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Table 2 Weekly mean of mortality numbers and proportions of specimens positive for influenza (virus %) during the periods with low, middle and high levels of environmental factors

From: Effect modification of environmental factors on influenza-associated mortality: a time-series study in two Chinese cities

   Mean (SD)
  City Low Middle High
    Temperature  
All-cause Guangzhou 520.5 (81.4) 424.0 (52.1) 407.3 (49.0)
  Hong Kong 798.6 (73.5) 677.5 (48.6) 655.9 (36.6)
CRD Guangzhou 300.5 (61.6) 227.1 (43.6) 213.4 (37.4)
  Hong Kong 382.7 (47.5) 296.4 (35.3) 275.6 (25.4)
P&I Guangzhou 11.3 (4.9) 9.7 (4.3) 9.5 (3.3)
  Hong Kong 90.8 (15.1) 73.6 (14.1) 72.1 (11.9)
Accident Hong Kong 28.0 (7.6) 27.8 (6.9) 28.2 (5.2)
Virus % Guangzhou 5.6 (5.6) 9.2 (11.9) 7.7 (8.4)
  Hong Kong 11.1 (9.1) 12.1 (11.7) 13.8 (10.8)
    Relative humidity  
All-cause Guangzhou 441.9 (87.7) 441.0 (72.9) 451.9 (64.2)
  Hong Kong 722.6 (92.4) 693.7 (71.4) 699.7 (71.1)
CRD Guangzhou 241.1 (65.5) 239.9 (56.7) 247.1 (54.8)
  Hong Kong 328.0 (65.6) 306.6 (51.2) 309.9 (49.5)
P&I Guangzhou 9.3 (4.1) 10.1 (4.1) 10.6 (4.6)
  Hong Kong 76.9 (16.8) 77.5 (16.0) 78.0 (14.7)
Accident Hong Kong 26.5 (7.7) 28.3 (5.8) 28.7 (7.1)
Virus % Guangzhou 2.0 (3.3) 7.1 (8.2) 15.8 (12.2)
  Hong Kong 4.3 (6.4) 14.8 (10.9) 15.2 (10.6)
    Vapor pressure  
All-cause Guangzhou 498.2 (91.7) 432.1 (59.8) 413.4 (53.0)
  Hong Kong 790.8 (79.4) 680.6 (53.8) 657.7 (36.1)
CRD Guangzhou 284.4 (68.8) 233.2 (48.2) 217.2 (42.1)
  Hong Kong 376.0 (53.7) 299.1 (39.0) 277.0 (25.2)
P&I Guangzhou 10.6 (5.1) 9.9 (3.6) 9.6 (4.5)
  Hong Kong 89.2 (16.5) 74.3 (14.3) 72.1 (11.8)
Accident Hong Kong 28.2 (7.8) 28.0 (6.7) 27.6 (5.4)
Virus % Guangzhou 4.3 (5.3) 8.3 (10.5) 10.8 (11.1)
  Hong Kong 9.9 (9.4) 12.1 (11.2) 14.9 (11.3)
  1. SD standard deviation; CRD cardiorespiratory; P&I pneumonia and influenza