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Variable in the multiple regression models
| Dependent variable | |
| Dt | Number of DF/DHF cases based on monthly report from the Sukhothai Provincial Public Health office, Ministry of Public Health |
| Independent variables | |
| T | Maximum monthly temperature(°C) |
| R | Total monthly rainfall (mm./month) |
| H | Maximum monthly relative humidity(%) |
| t | time in month |
| t-1 | one month before t |
