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.
Early bubonic plague symptoms can include: Buboes (tender, enlarged lymph nodes under the armpits, in the neck, or in the groin, ranging in size from 1 to 10 cm., and found in 70 percent of patients) Fever. Headache.