Odds ratio	Unadjusted 95% CI	Bonferroni adjusted 95% CI
Base Incentive
$30 (ref)	--	--	--
$40	1.25	1.01–1.54	0.97–1.61
$50	1.23	1.00–1.52	0.96–1.59
Experimental Group
Email (ref)	--	--	--
Sweepstakes and Email	1.03	0.74–1.43	0.63–1.68
IVR	0.56*	0.38–0.82	0.32–0.98
Phone Prompt	1.14	0.83–1.57	0.71–1.85
Postcard	2.29*	1.71–3.07	1.48–3.56
Sweepstakes, Email, IVR, Phone Prompt & Postcard	4.16*	3.14–5.50	2.73–6.31	,
*Indicates that the odds ratio remained significant at the p<.05 level after adjusting for multiple comparisons.