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The 110-item version of DELTA9 should be used instead of the 120-item version (DELTA10) because the 10 items of Social Anhedonia have been excluded from the instrument. The syntax files for the 120-item version are provided for users who wish to calculate DELTA9 scores based on a previous version of the instrument (the 10 Social anhedonia items are part of the instrument, but are not taken into account when calculating the total score).
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