Similarly, an increase of each 1% in relative humidity, 50 mm in rainfall or 5 hour of sunlight corresponded to an increase of 9, 8% (RR=1.098, 95% CI=1.087 - 1.110); 1.7% (RR=1.017, 95% CI=1.005 - 1.029); 3.4% (RR=1.034, 95% CI=1.029 - 1.040) in the monthly number of HFMD cases respectively.