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Group choices and profile categories
| Profile | % subjects | % red |
| Free-rider | 13 | 17* |
| Altruist | 4 | 75* |
| Conditional cooperation | 77 | 35 |
| Other | 7 | 43 |
| All profiles | 100 | 35 |
The table shows the distribution of conditional contribution profiles as well as part III group choices for studies 2, 3, and 4. All numbers are in percentages.
Denotes group compositions that are different from the other groups at a 1% level of confidence using a Fischer test (n = 324).
