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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Mol Psychiatry. 2010 Sep 21;16(11):1147–1154. doi: 10.1038/mp.2010.97

Table 2.

Scores on the Achievement Scale (surrogate trait measure of motivation) and on the Positive and Negative Emotionality and Constraint factors from the Multidimensional Personality Questionnaire (MPQ) in controls and ADHD participants. Comparisons correspond to independent t tests (two tail). Measures correspond to mean and standard deviations.

Controls (n=41) ADHD (n=45) p
Achievement Scale 15 ±3 11 ±5 0.0003
Positive Emotionality 52 ±10 48 ±14 0.13
Negative Emotionality 12 ±9 16 ±11 0.04
Constraint 52 ±10 42 ±12 0.0001