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.
Lyme disease symptoms can appear quickly or gradually over time, and they are incredibly varied and can wax and wane. The first physical signs of Lyme infection are often flu-like symptoms â sore throat, headaches, congestion, stiffness, etc. â so many people, including doctors, dismiss the symptoms as the flu.