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Citation:

CTEPP STANDARD OPERATING PROCEDURE FOR SAMPLE SELECTION (SOP-1.10).

Impact/Purpose:

The CTEPP study is the largest aggregate exposure study of preschool children (ages 2 to 5 years) conducted in the United States. The CTEPP study was designed in part to fill in critical data gaps on young children’s exposures to pesticides in response to the Food Quality Protection Act (FQPA) of 1996.

Description:

The procedures for selecting CTEPP study subjects are described in the SOP. The primary, county-level stratification is by region and urbanicity. Six sample counties in each of the two states (North Carolina and Ohio) are selected using stratified random sampling and reflect three distinct geographical areas in each state. Within each of the two states, the samples are further stratified according to urbanicity and family income. The urbanicity stratification is imposed at the first stage of selection by classifying counties as predominantly urban or predominantly rural. Income stratification is performed at subsequent stages of selection for the two sample components, which distinguishes between low-income and mid- to high-income households/daycare centers.

In the daycare sample component, all eligible daycare centers in the six selected counties are identified. During the second-stage sampling frame, these centers are divided into two income strata. From these strata a random sample of targeted centers and a random sample of eligible children within each participating center are selected. In the telephone sample component, a random sample of telephone numbers is selected using list-assisted telephone sampling techniques in the six counties in each state. The anticipated sample size is 128 children in each state, with half (64) from the daycare center sample (children who attend daycare) and the other half (64) from the telephone sample (children who do not attend daycare). This dual frame approach provides maximum coverage for the target population.

In summary, the design simplifies the sampling frame construction and sample selection process. In addition, it allows the project to concentrate recruitment efforts in the selected counties so project resources can be more efficiently used to maximize response rates.

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