How does this rare crypt armour have % chance to dodge attacks?

Modifiers

The Fall of Oriath introduced several new tiers of suffix modifiers to Dexterity body armour and shields that grant attack dodge and several new tiers of suffix modifiers to Dexterity shields that grant spell dodge. These modifiers also affect Dexterity hybrid attribute base items, including Sacrificial Garb. The Essences of Loathing and Scorn provide suffix mods that grant attack dodge and spell dodge, respectively, on body armour and boots. Corruption can grant a corrupted implicit mod on boots that gives (2 to 4)% Chance to Dodge Attacks. Certain helmet and boot Enchantments can grant conditional dodge or spell dodge.

From the wiki