National Survey of Lead and Allergen Hazards in Housing

We propose to conduct a scientifically valid, descriptive survey to measure the prevalence
and levels of lead in dust, soil, and paint, and the prevalence and levels of various indoor
allergens in floor and bedding dust in the nation's housing stock. The survey strategy is a
population-based, multi-stage area probability sample designed to represent all 50 states.
The survey will include approximately 1000 homes in at least 100 primary sampling units (PSU,
a metropolitan area or cluster of counties). Residents of candidate participant housing units
(HUs) will initially be contacted by a letter to introduce and provide a brief explanation of
the study. A field interviewer will then visit each candidate HU to screen and recruit
eligible units into the study. A short Screening Questionnaire will be administered to an
adult HU resident and an invitation will be extended to those HUs that are eligible to
participate in the study. A field data collection visit will be scheduled for the following
week, at the resident's convenience. The collection visit will be conducted by a two member
team (including the same field interviewer that will conduct the screening/recruiting visit)
and will consist of administration of an informed consent form and Data Collection
Questionnaire, completion of home observation forms, collection of interior dust and exterior
soil samples, and conduct of nondestructive paint lead analyses on both interior and exterior
walls. Soil and dust samples will be shipped to analytical laboratories for lead and allergen
analysis. Extensive survey design, procedure, and reporting details are provided in the
National Survey Lead Hazards and Allergens in Housing: Protocol and Sample Design Report. It
is anticipated that this study will provide allergen-specific data regarding: 1) housing
conditions, demographic factors, and climate to facilitate evaluation of regional, ethnic,
socioeconomic, and housing characteristic differences in the indoor allergen burden; 2) an
estimate of indoor allergen exposure in the U.S. population; 3) baseline data that can be
used as a reference point for future allergen surveys; and 4) a database that can be used to
stimulate future studies which attempt to correlate allergen exposure to disease outcome. The
study will yield lead hazard data to: 1) estimate the number and percent of homes with dust
and soil lead levels above selected thresholds; 2) identify sources of lead in dust in
housing; 3) permit future analysis of lead hazard control strategies and costs, including
associated policy and regulatory guidelines.

- INCLUSION CRITERIA:

The target population for the Survey is the national housing stock of approximately 95
million housing units.

The decision to include or exclude a subset is usually based on such factors as relevancy
to the study objectives, availability of data from other sources, and effort required to
obtain the study data.

None of the possible housing type exclusion or oversampling proposals are based upon
gender, race, ethnic, cultural, or biological factors.

Housing built after 1977.

Housing units in multi-family buildings.

Manufactured housing units, i.e., mobile homes and trailers.

EXCLUSION CRITERIA:

Housing where children are not permitted to live (elderly housing, nursing homes, college
dormitories, etc.).

Group housing - both institutional (prisons or jails, detention centers, hospitals,
military housing, etc.) and non-institutional (dormitories, fraternities, orphanages,
rooming houses, missions, work camps, convents, etc.).

Vacant housing.

Short-term housing. This category includes homes which are not the resident's sole or
permanent home, and which the resident present at the time of field data collection spends
less than three months per year. This includes seasonal, occasional use, recreational, and
second homes, as well as homes for migrant workers.

Hotels and motels.