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The Dietary Questionnaire (DQX) is a food frequency questionnaire that was administered at baseline to the participants in the intervention arm only. The questionnaire data has been processed so that the dataset contains nutrient data in grams. To learn more about the Dietary Questionnaire (DQX) data collected as part of the study, visit the PLCO Dietary (DQX) 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.

User Guides and Other Files

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

PLCO User Guide
(PDF - 291.4 KB)
For Dietary Questionnaire (DQX) Data:
Data Dictionary
(PDF - 911.7 KB)
User Guide
(PDF - 368.5 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.

Dietary Questionnaire
DQX - Scanned (3.8 MB)