Analysis of data obtained from discrete variables requires the use of specific statistical tests which are different from those used to assess continuous variables (such as cardiac output, blood pressure, or PaO 2) which can assume an infinite range of values.
Primary symptoms of dengue appear three to 15 days after the mosquito bite and include the following: 1  high fever and severe headache, 2  with severe pain behind the eyes that is apparent when trying to move the eyes.
1 Fever, headache, muscle pain, and rash may occur in both chikungunya and dengue. In addition, chikungunya is likely to give rise to severe and prolonged joint pains, which is one of the symptoms that distinguish it from dengue. Hemorrhagic manifestations are more likely in dengue fever.  Vector.