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.
Recognizing Symptoms of Dengue Fever. 1  1. Expect an incubation period of four to seven days. Once you are bitten by a mosquito that is carrying dengue fever, the average time for symptoms to begin is four to seven days. 2  2. Take your temperature. A high fever is the first symptom to appear. 3  3. Watch for flu-like symptoms.