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The primary sampling method for the NSAF was a random selection of telephone numbers; a sample of households without telephones was also included. The survey was designed to oversample people with low incomes so that analysts could obtain a more detailed picture of this portion of the population. To obtain information on children, researchers surveyed the adult most knowledgeable about the children in the household.
1997 Survey:
Detailed information was obtained on 75,437 adults and 34,439 children in 44,461 households. Data collected Feb — Nov 1997.
1999 Survey:
Almost 46,000 households interviewed, with similar counts of adults and children. Data collected Feb-Oct 1999.
2002 Survey:
Planned at about 40,000 households. Broadly similar to earlier rounds.
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