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.
Symptoms of Dengue. You can notice the symptoms of dengue in 3 â 6 or within 15 days after being infected. The symptoms can happen in stages. Usually, the symptom starts with a chill, then headache, pain in the movement of eyes, followed by a low backache and loss of appetite.