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In the DCCT Diet History, variable supplement has values other than documented values of 0 (no) and 1 (yes). Why?

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In the DCCT Diet History, variable supplement has values other than documented values of 0 (no) and 1 (yes). Why?

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A. There are 3,802 codes of zero, 1,424 codes of one, plus 7 codes of nine. We suggest that 9s be treated as missing or erroneous data entries.

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