The ammount of ethanol ingested daily, on average. Multiply v/v concentration of each type of drink with the ammount you drank, in mL and add for all types. For example, 0.5 liters of 5% beer represents 0.5x0.05=0.025L=25mL. If one drinks one such beer a day, every day, the value of this variabile should be 25.
Reference: PREDICL