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| Author | Definition used |
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| Barragán et al. (2017) | ADHD of any subtype. Diagnosed according to the DSM-IV criteria and CGI-S scale. |
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| Bos et al. (2015) | ADHD diagnosis confirmed by a trained researcher using the DISC-P. |
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| Matsudaira et al. (2015) | ADHD diagnosis confirmed through a semi-structured interview based on the DSM-IV criteria. |
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| Milte et al. (2015) | Diagnosis of ADHD or parent-rated symptoms >90th percentile on the CPRS and parent-reported learning difficulties. |
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| Wu et al. (2015) | ADHD diagnosed according to DSM-IV and the Chinese version of CPRS. These rating scales about learning, attention, and behaviour were completed by the teachers and either parent(s) or guardians. |
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| Widenhorn-Müller et al. (2014) | Met DSM-IV criteria for the ADHD combined subtype (hyperactive–inattentive) and the primarily inattentive or the hyperactive/impulsive subtype were included in the trial. |
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| Manor et al. (2013) | Children were included if they had a score of at least 1.5 standard deviations above the normal for the patient’s age and gender in the Teacher-Rated ADHD Rating Scale-IV School Version. |
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| Hariri et al. (2012) | Conners’ Abbreviated Questionnaires scores for hyperactivity were greater than 14. |
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| Johnson et al. (2012) | Participants met DSM-IV criteria for a diagnosis of ADHD. |
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| Milte et al. (2012) | Diagnosis of ADHD or parent-rated symptoms >90th percentile on the CPRS and parent-reported learning difficulties. |
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| Perera et al. (2012) | All children in the program were clinically diagnosed using DSM-IV supported by positive scores in Swanson, Nolan, and Pelham version IV (SNAP) parent and teacher evaluation. |
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| Gustafsson et al. (2010) | Clinical diagnosis of ADHD of combined type (fulfilling DSM-IV criteria A–E) with any neuropsychiatric comorbidity and who had been evaluated for pharmacological treatment. |
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| Johnson et al. (2009) | Participants met DSM-IV criteria for a diagnosis of ADHD of any subtype, scoring at least 1.5 SD above the age norm for their diagnostic subtype using norms for the ADHD Rating Scale–IV–Parent Version. |
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| Raz et al. (2009) | Parents were asked to present a formal ADHD diagnosis. The child performed a continuous performance test, while one of the parents filled in the essential fatty acids deficiency questionnaire and the DSM-IV questionnaire. |
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| Hirayama et al. (2004) | Diagnosed or suspected as AD/HD according to DSM-IV and diagnostic interviews including behaviour observation by psychiatrists. In a strict sense, eight subjects might not be AD/HD according to the DSM-IV criteria, but two psychiatrists attending the summer camp strongly suspected them as AD/HD. |
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| Voigt et al. (2001) | Previously been given a diagnosis of ADHD by a physician. Confirmatory diagnostic interview with a neurodevelopmental paediatrician to confirm responses to the telephone interview and to ensure that each met DSM-IV. |
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