Attributes

Attributes are values that describe various aspect of your character and how they act in combat. The general attributes are vitality (affects health), strength (affects damage), and wisdom (affects maximum mana and mana regeneration). These also assist in the attributes damage (strength), max health (vitality), and max mana (wisdom). The class attributes are stamina (paladin), will (witcher), and intuition (berserker). Backpack space and belt space are also attributes, but non-combat ones.

Vitality and Max Health
Vitality adds directly on to maximum health, one point of vitality adds one to max health.

Strength and Damage
Damage is increased by adding strength. Every 10 points of Strength adds about one point of damage, to both the minimum and the maximum damage.

Wisdom and Max Mana
It appears that Wisdom adds directly to Maximum Mana (point for point).