## Methodology - Adults with HIV
This rate has been calculated in two steps. First, the adult
population (15+) has been calculated. Secondly, the number of adults
with HIV has been divided by the adult population. As the rates are
normally very small the number is given in adults with HIV per 1,000
adults. On average 22.45 adults per 1,000 are infected with AIDS with
a standard deviation of 50.36. The lowest number is 0.06 adults
(Afghanistan) while the highest one is 345.77 (Swaziland). ### For countries
__above__ the mean the points for the score-bar are calculated as follows:
With the calculated mean and standard deviation an assumed normal
distribution has been calculated. The probability of a value equals the
minus-points, i.e. a probability of 67% equals 33 points (100 - 67). ### For countries
__below__ the mean the points for the score-bar are calculated as follows:
As no infections reflects the absolute minimum this value should be
100 points. The average infection rate should equal 50 points. This
means that for every 0.45 adults/1,000 adults a minus-point is given.
This method has been chosen as otherwise a country with no infections
would just get about 68 points when applying the assumed normal
distribution method. This would not reflect the good performance of the
country in that area. ### Sources
United Nations:
last update 15 August 2006
United Nations: last update 22 April 2005 |