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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.



United Nations:  last update 15 August 2006

United Nations: last update 22 April 2005


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