Table 1.
Incentive types tested.
| Group name | Round | Description | Incentive contingent upon returning the kit |
|---|---|---|---|
| Control | 1 + 2 | No incentive offer | N/A |
| Voucher | |||
| GBP 5 voucher | 1 + 2 | Receive £5 Tesco voucher | Yes |
| GBP 10 voucher | 2 | Receive £10 Tesco voucher | Yes |
| Lottery | |||
| Lottery with expected value (EV) of £5 | 1 | Entered into a lottery with a 90% chance of £0 payoff and a 10% chance of a £50 Tesco voucher | yes |
| Choice – certain reward versus lottery | |||
| Choice with EV of GBP 5 | 1 | Given choice of receiving a £5 Tesco voucher or being entered into the lottery described above | yes |
| Choice with EV of GBP 10 | 2 | Given choice of receiving a £10 Tesco voucher or being entered into a lottery with a 90% chance of £0 payoff and a 10% chance of a £100 Tesco voucher | Yes |
| Endowment | |||
| GBP 5 endowment | 1 | Receive £5 Tesco voucher with kit | No |
| GBP 10 endowment | 2 | Receive £10 Tesco voucher with kit | No |
| Charity | |||
| GBP 5 charity | 1 | Receive £5 donation on their behalf to Children in Need (a UK children's charity) | Yes |