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 symptoms of Reye's syndrome usually begin a few days after a viral infection, such as a cold, flu or chickenpox. Initial symptoms can include: vomiting repeatedly. tiredness and lack of interest or enthusiasm. rapid breathing. fits (seizures)