0 = male
1 = female

1 = below 22
2 = 22-27
3 = 27-35
4 = 35-50
5 = above

pre-decided or naive group - only predecided groups made individual decisions
0 = naive WNV
1 = predecided WNV

0 = loss
1 = gain

a = riskless (certain)
b = risky