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Table 3 Percentage change (%) of mortality counts associated with 1% increase in influenza virus activity during the low, middle and high periods of temperature, relative humidity and vapor pressure

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

Disease City Percentage change (95% CI) Deviance Deviance p-value*
   Low Middle High (main) (interaction)  
   Temperature    
All-cause Guangzhou 0.02 (-0.50, 0.54) 0.29 (0.07, 0.50) 0.26 (-0.11, 0.63) 608.3 603.5 0.089
  Hong Kong 0.11 (-0.08, 0.30) 0.15 (0.01, 0.28) 0.24 (0.06, 0.41) 343.9 340.6 0.187
CRD Guangzhou 0.15 (-0.56, 0.86) 0.41 (0.11, 0.72) 0.50 (-0.03, 1.03) 642.2 638.9 0.188
  Hong Kong 0.13 (-0.14, 0.39) 0.27 (0.08, 0.47) 0.49 (0.24, 0.74) 320.8 310.7 0.006
P&I Guangzhou 0.14 (-1.71, 2.03) 1.37 (0.64, 2.09) 0.82 (-0.41, 2.06) 189.3 186.1 0.201
  Hong Kong 0.38 (-0.11, 0.86) 0.66 (0.33, 1.00) 0.79 (0.36, 1.23) 241.2 238.0 0.203
Accident Hong Kong 0.32 (-0.34, 0.98) 0.20 (-0.24, 0.63) 0.11 (-0.44, 0.67) 159.1 158.9 0.871
   Relative humidity    
All-cause Guangzhou -0.60 (-1.50, 0.32) 0.13 (-0.13, 0.40) 0.44 (0.20, 0.68) 608.3 579.8 < 0.001
  Hong Kong 0.04 (-0.26, 0.33) 0.13 (0.01, 0.25) 0.29 (0.12, 0.46) 343.9 333.7 0.006
CRD Guangzhou -0.79 (-2.04, 0.48) 0.32 (-0.05, 0.70) 0.57 (0.23, 0.91) 642.2 621.3 < 0.001
  Hong Kong 0.22 (-0.18, 0.62) 0.27 (0.09, 0.44) 0.41 (0.16, 0.66) 320.8 317.4 0.178
P&I Guangzhou -1.67 (-4.95, 1.74) 0.89 (-0.02, 1.81) 1.66 (0.85, 2.48) 189.3 183.5 0.055
  Hong Kong 0.52 (-0.22, 1.26) 0.60 (0.29, 0.91) 0.76 (0.34, 1.18) 241.2 240.1 0.570
Accident Hong Kong 0.91 (0.00, 1.83) 0.13 (-0.27, 0.53) 0.26 (-0.29, 0.81) 159.1 155.3 0.144
   Vapor pressure    
All-cause Guangzhou -0.20 (-0.75, 0.35) 0.27 (0.04, 0.51) 0.35 (0.07, 0.62) 608.3 594.0 0.001
  Hong Kong 0.13 (-0.07, 0.32) 0.11 (-0.03, 0.25) 0.26 (0.09, 0.42) 343.9 336.7 0.027
CRD Guangzhou -0.06 (-0.81, 0.70) 0.38 (0.05, 0.71) 0.54 (0.16, 0.93) 642.2 632.1 0.006
  Hong Kong 0.14 (-0.13, 0.41) 0.24 (0.04, 0.44) 0.49 (0.25, 0.72) 320.8 309.6 0.004
P&I Guangzhou -0.05 (-2.03, 1.98) 1.04 (0.23, 1.86) 1.58 (0.73, 2.44) 189.3 185.8 0.172
  Hong Kong 0.45 (-0.04, 0.93) 0.71 (0.36, 1.06) 0.67 (0.26, 1.08) 241.2 239.3 0.391
Accident Hong Kong 0.49 (-0.16, 1.14) 0.23 (-0.22, 0.68) -0.02 (-0.54, 0.50) 159.1 157.3 0.392
  1. CRD cardiorespiratory; P&I pneumonia and influenza; CI confidence interval
  2. * p-value was derived from the likelihood ratio test between the interaction and main effect model