Table 1 Correlation coefficients between monthly positive ONI and Dengue Cases; and rainfall and Dengue Cases (2014–2018) with different lag periods in Delhi and Visakhapatnam (*indicates p value at 5% significance level)
From: El Niño Southern Oscillation as an early warning tool for dengue outbreak in India
Lag-month | Delhi (Correlation coefficient, ‘r’) | Visakhapatnam (Correlation coefficient, ‘r’) | ||
|---|---|---|---|---|
Positive ONI & dengue cases | Rainfall & dengue cases | Positive ONI & dengue cases | Rainfall & dengue cases | |
0 | 0.368 | −0.053 | −0.541 | 0.316 |
1 | 0.429* | 0.189 | −0.545* | 0.661 |
2 | 0.401* | 0.412* | −0.552* | 0.742* |
3 | 0.217 | 0.285 | −0.537* | 0.501* |
4 | −0.152 | 0.093 | −0.498 | 0.141 |
5 | −0.178 | 0.079 | −0.44 | −0.111 |
6 | −0.131 | 0.088 | −0.431 | −0.293 |
S Error | 0.105 | 0.058 | 0.019 | 0.147 |