Second National Communications 33 r* – pearson correlation; p = level of significance Graph 1. Quarterly Trend of Cholera Cases and Relative Humidity, Albay, 1993-1999 In Albay, the number of cholera cases tends to be higher when the weather humidity is lower. Correlation analysis shows that the number of cholera cases is negatively associated with weather humidity (r = -.623, p <.01). Also the number of cholera cases tends to increase when the amount of rainfall decreases. Correlation analysis shows that the number of cholera cases is negatively associated with rainfall (r = -.386, p <.05). Graph 2. Quarterly Trend of Cholera Cases and Rainfall, Albay, 1993-1999 12 R a in f u ll ( m m / d a y) C h o le ra 10 8 6 4 2 Q 1Q 199 2- 3 Q 199 3- 3 Q 199 4- 3 Q 199 1- 3 Q 199 2- 4 Q 199 3- 4 Q 199 4- 4 Q 199 1- 4 Q 199 2- 5 Q 199 3- 5 Q 199 4- 5 Q 199 1- 5 Q 199 2- 6 Q 199 3- 6 Q 199 4- 6 Q 199 1- 6 Q 199 2- 7 Q 199 3- 7 Q 199 4- 7 Q 199 1- 7 Q 199 2- 8 Q 199 3- 8 Q 199 4- 8 Q 199 1- 8 Q 199 2- 9 Q 199 3- 9 Q 199 4- 9 19 99 0 20 15 10 5 0