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 principal symptoms of dengue are: 1  High fever. 2  at least two of the following: 3  Severe headache. 4  Severe eye pain (behind eyes). 5  Joint pain. 6  Muscle and/or bone pain.7  Rash. 8  Mild bleeding manifestation (e.g., nose or gum bleed, petechiae, or easy bruising).engue hemorrhagic fever (DHF) is characterized by a fever that lasts from 2 to 7 days, with general signs and symptoms consistent with dengue fever. When the fever declines, warning signs may develop.