Recruitment Update as of 6/23/2020

ATSDR PFAS Exposure Assessment Recruitment Update June 23, 2020

Below is a brief description of our recruitment strategy and participation rates for the Exposure Assessments.

Site	Approximate Recruitment Dates	Recruitment Approach	Sample Frame Size (households)	Total Invitations (households)	Participation	Overall Household Participation Rate
Hampden County, MA	7/29/19-8/27/19	Random selection, two waves	4,776	1,349	459 individuals, 247 households	18.3%
Berkeley County, WV	7/29/19-9/16/19	Convenience sample	2,922	2,922	275 individuals, 166 households	5.7%
New Castle County, DE	9/2/19-10/9/19	Random selection, two waves	5,998	3,000	214 individuals, 134 households	4.5%
Spokane County, WA	9/23/19-10/28/19	Convenience sample	2,546	2,546	333 individuals, 168 households	6.6%
Lubbock County, TX	1/22/20-2/18/20	Convenience sample	702	702	219 individuals, 106 households	15.1%*

*Final eligibility has not been determined for Lubbock County so final numbers may be slightly lower.

Note: Households that did not participate could have been ineligible (did not meet the residency requirement), uninterested, or unreachable.

The recruitment approaches used are consistent with the PFAS Exposure Assessment Protocol. For the smaller samples frames (<3,000 households), random selection became a convenience sample because all households in the sample frame were invited to attempt to maximize the number of participants.