Alcohol consumption
0 = non-drinker
1 = 1 drink per week
2 = 1-2 drinks per week
3 = 2 drinks per week
4 = 2-3 drinks per week
5 = 3 drinks per week
6 = 3-4 drinks per week
7 = 4 drinks per week
8 = 4-5 drinks per week
9 = 5 drinks per week
10 = 5-6 drinks per week
11 = 6 drinks per week
12 = 7-11 drinks per week
13 = 12+ drinks per week