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When I code certain Teenmark codes in the Twelveplus study, I get zeroes. Why?

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When I code certain Teenmark codes in the Twelveplus study, I get zeroes. Why?

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The MRI Twelveplus study includes data collected from the Teenmark study (teens 12-19) and the data from the Doublebase study (Adults 18+). If a question is asked only in the Teenmark questionnaire, and not in the Doublebase, then it will be marked with an “@” sign in the Teenmark/Twelveplus codebook, and will generate zeroes against the Twelveplus study.

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