Base-stats information confused

[leohero92]

https://github.com/Lailloken/Lailloken-UI/wiki/Item-info#base-stats-information
I understand all stats except this

This is base stats info on a Royal Plate - best STR based body armor, so as I understand 19% is not % compared to the best possible value within the item-class.

So what is this stat? And how is it calculated?

[Lailloken]

It's the base percentile of a defensive item, basically how close the defense stats are to the max roll of the given base-type.

(the tooltip would show 33% for this item)

If you assume this notation armor: x (y - z), then the base percentile is calculated this way (x-y) / (z-y). So (561-530) / (625-530) = 0.326, which is 33% when rounded up.

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The trade site also displays this value:

I'll add a clarification to the wiki.

[leohero92]

Thank you so much for detailed answer.