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Table 2 Results of logistic regression analysis of responses in the various incentive groups compared to the controls after 6 weeks and of the effects of sex and age.

From: Scratch lottery tickets are a poor incentive to respond to mailed questionnaires

  Odds ratio 95% conf. int. P-value
Controls (reference group) 1   
1 ticket 0.881 0.620–1.250 0.5
2 tickets 1.209 0.836–1.748 0.3
2 tickets later 0.920 0.647–1.309 0.6
50 NOK 2.489 1.612–3.841 0.0001
Female sex 1.547 1.204–1.987 0.001
Age (per year) 1.028 1.010–1.046 0.002