The county housing authority aided enrollment,
using its weatherization permission form
to ask whether any household member had
respiratory issues and referring potential participants
to the public health department.
The housing authority sent weatherization
application forms to those who passed the
phone screening.
Participants drawn from the previous HH-II
study served as this study’s historical comparison
group. Comparison group enrollment occurred
between November 2002 and October
2004, with CHW home visits ending in November
2005. CHWs for both the study and
comparison groups received the same training
and followed similar home visit protocols.
Comparison group eligibility criteria (similar to
the study group criteria) were as follows:
children aged 3 to 14 years with not-wellcontrolled
or very poorly controlled asthma;
income below 200% of the 2001 federal
poverty threshold or child enrolled in Medicaid;
caretaker’s primary language English,
Spanish, or Vietnamese; and residence in King
County, Washington. The HH-II research team
recruited comparison group children primarily
through community and public health clinics.