Table 3.

Total costs comparing $2 and $5 conditions and one versus two mailings

	$2 condition	$5 condition
First Mailing-total cost per participant*	$5.25	$8.25
First mailing response rate	47.67%	57.77%
Total cost/returned survey ($)	$11.01	$14.28
Second Mailing-total cost per participant**	$2.40	$2.40
Second mailing response rate	33.91%	22.50%
Total cost/returned survey ($)	$7.08	$10.67
Final Response
Cumulative response rate	65.41%	67.27%
Total cost/returned survey ($)	$9.95	$13.77

*total cost per survey included survey packet, incentive and reminder postcard

**total cost per survey included survey packet only