Is the reduction of a score over time the same between the general PI and distance category PI?

For the General Performance Index, the scores for every distance are decreased at the same rate.
For the Performance Index by distance category, the scores for shorter races are decreased at a faster rate than for long races. This is because ultra-distance runner will run far fewer races than a short-distance runner.

Is the performance index the same for women and men?

An identical calculation is applied for men and for women. It is therefore possible to directly the compare the performances of men with those of women, just as you would compare finish times in our sports.

To compare the level of performance of men and women within categories please see the ITRA LEVEL CHART below. For example, elite men have a score above 825 and women above 700. This chart was created using statistical analysis of all the runners in our database.