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.

	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