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Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted. The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit  cc.nih.gov. Updates regarding government operating status and resumption of normal operations can be found at OPM.gov.

Contamination Survey Datasets

The Contamination Survey Health Status Questionnaire (HSQ) was a survey to assess the rate of screening outside of the PLCO trial. It was administered to small samples of individuals from both trial arms at various times. Data were collected on screening for cancer and several other diseases. To learn more about the Contamination Survey data collected as part of the study, visit the PLCO Contamination Survey documentation page.

For each dataset, a Data Dictionary that describes the data is publicly available. In order to obtain the actual data in SAS or CSV format, you must begin a data-only request. Data will be delivered once the project is approved and data transfer agreements are completed.


Datasets and Data Dictionaries

Files Description
Data Dictionary
(PDF - 99.2 KB)
1. The Contamination Survey Health Status Questionnaire (HSQ) was a survey to assess the rate of screening outside of the PLCO trial. It was administered to small samples of individuals (n=13,000) from both trial arms at various times.

User Guides and Other Files

User Guides are intended to serve as a guide to using the data contained in these datasets.

For PLCO:
PLCO User Guide
(PDF - 291.4 KB)

Data-Collection Forms

The following forms were used to collect data that is now available in the datasets listed above. They are provided in PDF format.

Health Status Questionnaire - Female - Control Arm
Health Status Questionnaire - Female - Intervention Arm
Health Status Questionnaire - Male - Control Arm
Health Status Questionnaire - Male - Intervention Arm