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.
The rash may appear over most of your body 3 to 4 days after the fever begins, and then subsides after 1 to 2 days. You may get a second rash a few days later. Symptoms of dengue hemorrhagic fever include all of the symptoms of classic dengue plus.