Response rates to a mailed survey of a representative sample of cancer patients randomly drawn from the Pennsylvania Cancer Registry: a randomized trial of incentive and length effects

Table 2 Response rates by incentive amount, length and cancer type

Incentive amount	Colon RR2 (RR4)		Breast RR2 (RR4)		Prostate RR2 (RR4)		Total RR2 (RR4)
	Short	Long	Short	Long	Short	Long	Short	Long	Total	N
$3	50.6%	44.9%	69.7%	68.4%	71.6%	63.6%	64.3%	59.4%	61.8%	566
$5	52.1%	41.7%	70.7%	70.7%	69.1%	62.6%	64.1%	58.5%	61.3%	584
Total	47.3%^a (57.2%)		69.9%^b (73.3%)		66.7%^b (69.5%)		64.2%	58.9%	61.6% (67%)
Number of usable surveys	368		392		390		573	577	1150

^aResponse rates in parentheses are adjusted for estimated deaths, according to CDC and SEER data. Rates with different superscripts were significantly different from each other in logistic regression models.

ISSN: 1471-2288