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The CAPNET codebook describes the contents, structure, and layout of the CAPNET data collection. The codebook includes information on the following: variable names, variable labels, values, value labels, missing data and skip patterns. In addition the codebook notes contain instructions and comments contextualizing the information conveyed in the variable or values. The codebook also contains a detailed record of any changes made to the CAPNET data collection instruments and the timing of those changes.Investigators planning to use CAPNET data must use the codebook to assist in identifying and fully understanding the variables they want to utilize for a study. The CAPNET codebook will be updated twice a year.

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