[g1313]

Edit: I misremembered, they do ask if you had symptoms. From the paper:

The
survey asked for six data elements: zip code of residence, age, sex, race/ethnicity, underlying comorbidities, and prior clinical symptoms.

No, the only info they asked for in the recruiting questionnaire were age, gender, and zip code.

They did their primary recruit through Facebook ads (unknown targeting criteria) but your friends and family could send you the recruitment link. I know it was circulating in healthcare worker circles so certainly potential for bias there.

[g1313]

Edit: I misremembered, they do ask if you had symptoms. From the paper:

The
survey asked for six data elements: zip code of residence, age, sex, race/ethnicity, underlying comorbidities, and prior clinical symptoms.

No, the only info they asked for in the recruiting questionnaire were age, gender, and zip code.

They did their primary recruit through Facebook ads (unknown targeting criteria) but your friends and family could send you the recruitment link. I know it was circulating in healthcare worker circles so certainly potential for bias there.