-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
0 = Male
1 = Female

Ethnicity (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 = Not Hispanic or Latino
1 = Hispanic or Latino

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
0 = American Indian or Alaska Native
1 = Asian
2 = Black or African American
3 = Native Hawaiian or Other Pacific Islander
4 = White
5 = Mixed/More than 1 selected

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
0 = Single (never married)
1 = Married (first marriage)
2 = Remarried
3 = Separated
4 = Divorced
5 = Widowed
6 = Long-term domestic partner (at least 1 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
0 = Less than 7 years of school
1 = Junior High School (7-9th grade)
2 = Some High School (10-11th grade)
3 = High School graduate
4 = Some college or vocational training
5 = Four year college program
6 = 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
0 = Less than $5000
1 = $5000 - $9999
2 = $10000 - $14999
3 = $15000 - $19999
4 = $20000 - $24999
5 = $25000 - $29999
6 = $30000 - $34999
7 = $35000 - $39999
8 = $40000 - $49999
9 = $50000 - $59999
10 = $60000 - $74999
11 = $75000 - $99999
12 = $100000 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