Four-categories of Body Mass Index (BMI)
1 = Underweight
2 = Normal
3 = Overweight
4 = Obese

Computed level of education completed categories
1 = Did not graduate high school
2 = Graduated high school
3 = Attended college
4 = Graduate college

Computed income categories
1 = < $15,000
2 = $15,000 to < $25,000
3 = $25,000 to < $35,000
4 = $35,000 to < $50,000
5 = $50,000 or more

Computed smoking status
1 = Current, smokes daily
2 = Current, smokes some days
3 = Former smoker
4 = Never smoked