The quantity of alcohol in the blood after drinking alcoholic drinks not only depends on the type of drink, but also on individual factors, including sex and body weight. Alcohol levels are the lowest with beer. 

After drinking spirits the alcohol level (the alcohol blood level) is higher than after drinking the same quantity of beer. In an 80 kg person the alcohol level will be lower than in someone of 50 kg, after enjoying the same quantity of drink. The alcohol blood level rises faster in women than in men. 

Beer&health