Table 2.

Response rates for each condition overall and by sociodemographic factor.

Sociodemographic factor			Long email only (n=1000)		Email only (n=250)		Email+letter (n=250)		Email+letter+gift (n=250)		Email+postcard (n=250)		Email+gift card (n=250)		Email+letter+ gift card (n=250)		Email+postcard+gift card (n=250)
Minutes to complete survey, mean (SD)			20.4 (21.1)		14.6 (9.6)		15.6 (7.0)		18.3 (11.5)		21.7 (22.0)		22.0 (18.6)		16.6 (7.1)		18.4 (14.3)
Overall response rate			2.6%		8.0%		11.2%		15.6%		8.4%		14.4%		18.4%		18.4%
Race
	White	3.1%		9.0%		11.7%		18.1%		8.9%		15.9%		19.0%		18.7%
	Non-White	0.0%		2.6%		9.1%		4.3%		6.4%		8.2%		16.0%		17.3%
Ethnicity
	Non-Hispanic	2.8%		8.1%		11.3%		16.8%		7.9%		15.6%		16.9%		17.0%
	Hispanic	1.5%		7.4%		10.3%		8.3%		11.8%		7.9%		27.0%		25.0%
Gender
	Male	1.7%		8.8%		15.2%		11.8%		5.8%		12.2%		15.4%		18.1%
	Female	3.3%		7.4%		7.2%		20.2%		10.8%		16.8%		21.9%		18.7%
Years since last visit
	<2	3.3%		8.1%		14.9%		17.3%		9.9%		17.4%		21.1%		20.4%
	2-5	1.0%		6.9%		3.4%		12.2%		5.1%		7.7%		12.0%		13.0%
Age (years)
	<65	2.8%		4.1%		10.8%		11.2%		5.6%		14.2%		21.1%		19.2%
	≥65	2.5%		11.7%		11.5%		18.9%		10.6%		14.6%		15.7%		17.7%
Cancer status
	Invasive cancer	3.0%		7.6%		14.0%		16.8%		9.8%		14.4%		17.8%		20.5%
	Benign, in situ, or no cancer	1.2%		9.1%		5.1%		12.1%		4.5%		14.5%		20.8%		10.9%
ADIa decile
	1-5 (less disadvantaged)	2.9%		9.9%		13.8%		17.2%		12.0%		14.9%		19.2%		21.2%
	6-10 (more disadvantaged)	1.9%		5.1%		6.5%		14.9%		3.1%		13.0%		19.1%		13.1%

^aADI: Area Deprivation Index.