Each of the blue numbers underneath each category are the total number of trends you have saved that favor that position
(or go against the opposite position). Click on those numbers to view a list of all of those trends in detail.
Each of the numbers under the AVG Power columns equal the average power rating for all of the corresponding active trends that you have designated a power rating for
(scale of 1-10 rounded to one decimal place). If you don't have a power rating designated for an active trend it does not factor into the calculation.