Colombia: 1973, 1985, 1993
Kenya: 1989, 1999
Mexico: 1970, 1990, 2000
United States: 1960, 1970, 1980, 1990
Vietnam: 1989, 1999

Colombia 1973: All households.
Colombia 1985-1993: Occupied [not vacant] dwellings.
Kenya 1989: Not group quarters.
Kenya 1999: All households.
Mexico 1970-2000: All households.
United States 1960: Not group quarters, not in cities with 50,000+ residents.
United States 1970: Not group quarters, only for year-round units.
United States 1980-1990: Not group quarters.
Vietnam 1989: All households with dwelling information.
Vietnam 1999: All households.

SEWAGE indicates whether the household has access to a sewage system or septic tank.

The first digit of SEWAGE indicates whether the household has access to a sewage system or septic tank. This information is fully comparable across all samples. When more detail is available, the second digit distinguishes households connected to a sewage system from those with a septic tank. No detailed information is provided for households without a septic tank or connection to a sewage system. These include households with latrines, chemical toilets, other facilities, or no toilet facilities at all.

There are no problems of comparability across the Vietnam samples. SEWAGE is constructed from responses to the "type of toilet" question. The response "flushing toilet" has been coded as "Yes, sewage or septic tank" for the SEWAGE variable. Other responses have been coded as "No, not connected to sewage system or septic tank."