Responded to test offer
0 = No
1 = Yes

0 = Control
1 = Test

Income category (thousands)
1 = <25
2 = 25-49
3 = 50-74
4 = 75+

1 = Some high school or less
2 = High school
3 = Some college
4 = College
5 = Post-graduate

0 = Male
1 = Female

1 = North
2 = South
3 = East
4 = West