If possible, identify: E, the exposure(s) under study O, outcome(s) of interest;

Question

If possible, identify: E, the exposure(s) under study O, outcome(s) of interest; state whether the study design described is case report, case-series, ecological, cross-sectional, cohort, or case-control. The blood lead levels of 200 first-graders living in urban neighborhoods were compared to the blood lead levels of 200 first-graders living in suburban/rural neighborhoods. The IQ test scores and school performance of the 100 most-contaminated children and the 100 least-contaminated children were determined and compared in the 3rd, 6th, and 9th grades. Exposure Outcome: Study Design:

Explanation / Answer

Study design:

Case-control study

Exposure:

Blood lead levels-------> living in urban areas-------> living in sub-urban areas----->most contaminated children------> least contaminated children

Outcomes:

IQ scores------>less contamination

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