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9400 children (aged 0-14) from the child protective services (CPS) sample; 1100 children in the long-term foster care. Targeted number of completed CPS interviews is 5400 and LTFC interviews is 700.
For this nationally representative sample, children are randomly selected from 92 Primary Sampling Units (PSUs) in 98 counties and 36 states nationwide. For most areas of the country, the best definition of a PSU is the county since it corresponds to a clearly defined political entity and geographic area of manageable size. The PSU sampling frame was stratified into nine major strata; eight strata providing state-level estimates and one serving as the remainder stratum (28 states).
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