Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Relationship between materials used for household construction. Incidence is defined as cases/person/person-year at risk. Traditional floors are defined as earth floors, whereas modern floors are defined as cement, stone, or brick floors. Traditional walls are defined as mud and sticks or mud brick walls, whereas modern walls are defined as cement bricks or plaster. Traditional roofs are defined as thatched roofs, whereas modern roofs are defined as iron sheets or cement.
