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.
Dengue fever: Symptoms. The symptoms of dengue fever can closely resemble symptoms of influenza. They include fever, joint and bone pain, nausea, vomiting, headache, and fatigue. A rash may also occur about three to four days after onset of the fever.Symptoms may vary in character and severity between individuals.he symptoms of dengue fever can closely resemble symptoms of influenza. They include fever, joint and bone pain, nausea, vomiting, headache, and fatigue. A rash may also occur about three to four days after onset of the fever. Symptoms may vary in character and severity between individuals.