The effect of financial incentive on responses
| Returned | Not returned | |
|---|---|---|
| Financial v non-financial incentive method | ||
| Financial incentive (n=217) | 128 | 89 |
| No financial incentive (n=217) | 103 | 114 |
| χ2 analysis | χ2 = 5.78, 1 df, p=0.016 | |
| Individual administration methods (with/without financial incentive) | ||
| Postal with financial incentive | 61 | 41 |
| Postal without incentive | 55 | 47 |
| χ2 analysis | χ2 = 0.83, 1 df, p=0.47 | |
| Telephone with financial incentive | 45 | 20 |
| Telephone without incentive | 29 | 36 |
| χ2 analysis | χ2 = 8.03, 1 df, p=0.005 | |
| Clinic visit with financial incentive | 22 | 28 |
| Clinic visit without incentive | 19 | 31 |
| χ2 analysis | χ2 = 0.37, 1 df, p=0.17 | |