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Using controlled terminology and formatting from data collection through tabulation and analysis builds in traceability and transparency across study data. Controlled terminology and formats are required to be used as specified in this guide. General expectations for use of controlled terminology and formats are provided below in this section with more detailed expectations provided as part of sections specific to collection, tabulation, and analysis guidance. TIG metadata and specifications refer to controlled terminology and formats defined both within and external to this guide. 

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Standards for tabulation require representation of dates and/or times, intervals of time, and durations of time in ISO 8601 format as defined by the International Organization for Standardization (ISO) (http://www.iso.org).  Included in specifications...