Table 5 Effect of incentives at baseline (age 16), age 18 and age 20 year olds (the results that are statistically significant are in bold)
Covariate | Sub-group | Age 16 (baseline for incentives) | Age 18 | Age 20 | |||
|---|---|---|---|---|---|---|---|
Odds ratio | (95% CI) | Odds ratio | (95% CI) | ||||
All pupils (N = 8430) Type of reward offered at age 18 | 25 prizes of £20 (Group 2) | 1.01 | (0.86, 1.19) | 0.89 | (0.74, 1.05) | 0.91 | (0.77, 1.09) |
One £500 prize (Group 3) | 1.11 | (0.95, 1.30) | 1.00 | (0.85, 1.18) | 0.88 | (0.75, 1.04) | |
£10 voucher on receipt of completed questionnaire (Group 4) | .89 | (0.78, 1.02) | 1.87 | (1.64, 2.13) | 1.49 | (1.30, 1.70) | |
No reward (Group 1) | 1 | 1 | 1 | ||||