Table 4

Regression analysis of the relationship between monthly intussusception cases and monthly mean meteorological parameters

VariablesRegression coefficient, β (95% CI)SE, Sβχ2 valueP value
Pooled*
 Temperature (°C)0.026 (0.011 to 0.041)0.00812.098<0.01
 Rainfall (mm)−0.001 (−0.003 to 0)0.0012.4620.117
 Wind speed (km/hour)0.082 (0.061 to 0.103)0.01158.449<0.01
 Humidity (%)0.011 (0.007 to 0.016)0.00221.903<0.01
 Sunshine (hour)0.002 (0 to 0.003)0.0017.000<0.01
According to regions
North region*
 Temperature (°C)0.027 (0.007 to 0.047)0.01027.195<0.01
 Rainfall (mm)0.001 (−0.005 to 0.007)0.00290.1690.681
 Wind speed (km/hour)0.208 (0.101 to 0.315)0.054514.556<0.01
 Humidity (%)−0.010 (−0.020 to 0.001)0.00523.4480.063
 Sunshine (hour)0.004 (0.002 to 0.007)0.001311.006<0.01
South region*
 Temperature (°C)0.010 (−0.037 to 0.058)0.02430.1740.676
 Rainfall (mm)−0.004 (−0.009 to 0.000)0.00243.2510.071
 Wind speed (km/hour)−0.011 (−0.045 to 0.023)0.01730.4010.527
 Humidity (%)−0.033 (−0.070 to 0.005)0.01902.9490.086
 Sunshine (hour)0.002 (−0.001 to 0.004)0.00141.2130.271
East region*
 Temperature (°C)0.029 (0.001 to 0.057)0.01414.2450.039
 Rainfall (mm)−0.001 (−0.004 to 0.001)0.00140.7660.381
 Wind speed (km/hour)0.091 (0.042 to 0.141)0.025113.244<0.01
 Humidity (%)−0.021 (−0.035 to −0.007)0.00709.188<0.01
 Sunshine (hour)0.002 (−6.100 to 0.005)0.00123.8220.051
West region†
 Temperature (°C)0.052 (−0.02 to 0.124)1.9870.0360.159
 Rainfall (mm)−0.002 (−0.006 to 0.002)0.8550.0020.355
 Wind speed (km/hour)0.022 (−0.042 to 0.087)0.4630.0320.496
 Humidity (%)−0.002 (−0.016 to 0.011)0.1050.0060.746
 Sunshine (hour)0.003 (−0.001 to 0.007)2.4290.0020.119
According to age groups
2–6 months†
 Temperature (°C)0.012 (−0.004 to 0.028)0.0082.1920.139
 Rainfall (mm)−0.001 (−0.003 to 0.001)0.0011.5990.206
 Wind speed (km/hour)0.059 (0.037 to 0.081)0.01128.241<0.01
 Humidity (%)0.006 (0.001 to 0.011)0.0035.2760.022
 Sunshine (hour)0.002 (0.000 to 0.003)0.0014.6150.032
7–12 months*
 Temperature (°C)0.038 (0.018 to 0.057)0.01014.288<0.01
 Rainfall (mm)−0.001 (−0.003 to 0.002)0.0010.4470.504
 Wind speed (km/hour)0.08 (0.054 to 0.107)0.01336.037<0.01
 Humidity (%)0.012 (0.006 to 0.018)0.00314.660<0.01
 Sunshine (hour)0.002 (0.000 to 0.004)0.0015.1440.023
13–24 months†
 Temperature (°C)0.026 (0.006 to 0.047)0.0106.4600.011
 Rainfall (mm)−0.002 (−0.005 to 0.000)0.0013.5640.059
 Wind speed (km/hour)0.102 (0.077 to 0.128)0.01360.620<0.01
 Humidity (%)0.017 (0.010 to 0.024)0.00422.599<0.01
 Sunshine (hour)0.002 (0.000 to 0.004)0.0013.2110.073
  • *Tests used for regression analysis: negative binomial regression.

  • †Tests used for regression analysis: Poisson regression.