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 Worldwide, 2.5 percent of people infected with dengue fever die. 2  Dengue does not spread from person to person, but it possible to spread via blood transfusion and organ transplants. 3  In 1955 dengue fever was only reported present in 3 countries. 4  Today dengue is present in more than 120 countries.engue Fever Symptoms. Symptoms of dengue fever usually begin to manifest 3-7 days after being bitten by an infected mosquito, in some cases it may be up to 2 weeks before symptoms appear.