Age (BIQ, Intake, participant)
-9999 = Missing
-8888 = Question not asked
-7777 = Form updated during study, question not on new form
-6666 = Participant failed to complete
-3333 = Not applicable, nested question
-2222 = Question not applicable
-1111 = Participant deceased

Sex (BIQ, Intake, participant)
-9999 = Missing
-8888 = Question not asked
-7777 = Form updated during study, question not on new form
-6666 = Participant failed to complete
-3333 = Not applicable, nested question
-2222 = Question not applicable
-1111 = Participant deceased
1 = Male
2 = Female

Race (BIQ, Intake, participant)
-9999 = Missing
-8888 = Question not asked
-7777 = Form updated during study, question not on new form
-6666 = Participant failed to complete
-3333 = Not applicable, nested question
-2222 = Question not applicable
-1111 = Participant deceased
1 = White
2 = Black
3 = Hispanic
4 = Asian
5 = Other

Marital status (BIQ, Intake, participant)
-9999 = Missing
-8888 = Question not asked
-7777 = Form updated during study, question not on new form
-6666 = Participant failed to complete
-3333 = Not applicable, nested question
-2222 = Question not applicable
-1111 = Participant deceased
1 = Single
2 = Married
3 = Remarried
4 = Separated
5 = Divorced
6 = Widowed
7 = Long-term domestic partner (at least one year)

Years of school (BIQ, Intake, participant)
-9999 = Missing
-8888 = Question not asked
-7777 = Form updated during study, question not on new form
-6666 = Participant failed to complete
-3333 = Not applicable, nested question
-2222 = Question not applicable
-1111 = Participant deceased
1 = Less than 7 years of school
2 = Junior high school (7-9th grade)
3 = Some high school (10-11th grade)
4 = High school graduate
5 = Some college or vocational training
6 = A four year college program
7 = Graduate or professional training

Annual household income (BIQ, Intake, participant)
-9999 = Missing
-8888 = Question not asked
-7777 = Form updated during study, question not on new form
-6666 = Participant failed to complete
-3333 = Not applicable, nested question
-2222 = Question not applicable
-1111 = Participant deceased
5000 = less than $5,000
7500 = $5,000 to $9,000
12500 = $10,000 to 14,999
17500 = $15,000 to $19,999
22500 = $20,000 to $24,999
27500 = $25,000 to $29,999
32500 = $30,000 to $34,999
37500 = $35,000 to $39,999
45000 = $40,000 to $49,999
55000 = $50,000 to $59,999
67500 = $60,000 to $74,999
87500 = $75,000 to $99,999
100000 = $100,000 and above

Employed (BIQ, Intake, participant)
-9999 = Missing
-8888 = Question not asked
-7777 = Form updated during study, question not on new form
-6666 = Participant failed to complete
-3333 = Not applicable, nested question
-2222 = Question not applicable
-1111 = Participant deceased
0 = no
1 = yes