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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)

From: Retaining young people in a longitudinal sexual health survey: a trial of strategies to maintain participation

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