Group	# of Cases	Pre-paid Incentive ($5)?	Mail Questionnaire enclosed?	Treatment
Group 1	200	No	No	Refusal conversion letter reminding sample members of $20 incentive if they complete the telephone interview
Group 2	200	$5 bill	No	Refusal conversion letter reminding sample members of $20 incentive if they complete the telephone interview
Group 3	200	$5 bill	Yes	Refusal conversion letter reminding sample members of $20 incentive if they complete the telephone interview or offering $15 if they return the mail questionnaire instead