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 5 Comparison of respondents and non-respondents on demographic characteristics

	Colon cancer		Prostate cancer		Breast cancer		Total
Responded?	No	Yes	No	Yes	No	Yes	No	Yes
Age (median, SD)	73 (SD = 14)	70.5 (SD = 12)	67 (SD = 10)	68 (SD = 9)	64 (SD = 16)	60 (SD = 13)	70 (SD = 14)	66 (SD = 12)**
Gender (% Female)	51%	53%	NA		NA		NA
Stage 4	16%	13.5%	7%	2%*	10%	2.3%*	11.5%	5%
Race (% white)	94%	95%	84%	93%*	89%	94%	90%	94%
Marital status (% married)	45%	68%***	70%	85%**	47%	62%*	53%	72%

^aNon-missing n = 1150.
^bSignificance testing for age was conducted using non-parametric tests of medians. For all other variables, significance testing was conducted using Chi square analyses. *Represent significant differences between respondents and non-respondents on a particular demographic variable. *p < .05; **p < .01; ***p < .001

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