 - Current history or presence of drug or alcohol abuse, confirmed by positive test results for drugs of abuse andor alcohol or had a history of drug or alcohol abuse. Alcohol abuse was defined as: an average daily intake of more than 3 units or a weekly intake of more than 21 for males and 14 units for females where 1 unit equals 8-10 gram alcohol 1 unit equals 340 milliliter mL of beer, 115 mL of wine or 43 mL of spirits 