Table 6.
The impact of incentives according to socioeconomic status.
| Sample returned in 30 days from day of kit request Round 1 |
Sample returned in 30 days from day of kit request Round 2 |
Sample returned in 30 days from day of kit request Round 1 + 2 |
||||
|---|---|---|---|---|---|---|
| Odds ratio | z-stat | Odds ratio | z-stat | Odds ratio | z-stat | |
| Incentive structure | ||||||
| IMD*GBP 5 voucher | 1.00 | −0.07 | 0.99 | −0.40 | 1.00 | −0.14 |
| IMD*GBP 10 voucher | – | – | 1.01 | 0.64 | 1.01 | 1.26 |
| IMD*lottery EV GBP 5 | 1.00 | 0.30 | – | – | 1.00 | −0.15 |
| IMD*choice EV GBP 5 | 1.01 | 0.44 | – | – | 1.00 | 0.02 |
| IMD*choice EV GBP 10 | – | – | 0.98 | −1.15 | 0.99 | −0.78 |
| IMD*GBP 5 endowment | 0.99 | −0.54 | – | – | 0.99 | −1.11 |
| IMD*GBP 10 endowment | – | – | 0.99 | −0.59 | 1.00 | −0.24 |
| IMD*GBP 5 charity | 1.00 | 0.32 | – | – | 1.00 | 0.19 |
| Number of observations | 1489 | 1499 | 2988 | |||
| Wald χ2 (prob > χ2) | 88.36 (0.000) | 161.98 (0.000) | 211.53 (0.000) | |||
| Log pseudolikelihood | −851.5 | −787.2 | −1675.6 | |||
| Pseudo r2 | 0.047 | 0.131 | 0.069 | |||
Note: These specifications include the same explanatory variables as specifications shown in Table 5. All models clustered by first three letters of the postcode with varying numbers of clusters based on sample size.