Table 1 Summary of characteristics of included studies in the current meta-analysis.

From: Additive effects of EEG neurofeedback on medications for ADHD: a systematic review and meta-analysis

Author (year) [Ref]

Criteria

Comparison

Session

N

Duration (weeks)

Outcome

Subtype

IQ

Age (years)

Female (%)

Country

Lee (2017)20

DSM-IV-TR

EEG-NF (TBR) + Medication

20

18

10

1.ADHD RS: total, inattention, and H/I

2.ADHD Diagnostic System

Inattention (41.67%)

Combined (44.44%)

H/I (13.89%)

100.39

8.75 (6–12 years)

25

Korea

Medications

18

Tang (2014)31

DSM-IV

EEG-NF (TBR) + 

MPH: 18–54 mg/d

16

32

8

1.Chinese ADHD rating scale: total, inattention, and H/I

2.Attentional test: d2 test

N/A

N/A

8.6 (7–12 years)

45.31

China

MPH

32

Li (2013)21

DSM-IV

EEG-NF (TBR) + 

MPH: optimal dose (starting 5–10 mg/d, max. 60 mg/day)

40

32

N/A

ADHD RS-IV: total, inattention, and H/I

Inattention (65.6%)

Combined (29.7%)

H/I (4.7%)

N/A

10.6 (7–16 years)

15.6

China

MPH

32

Duric (2017)33

ICD-10

EEG-NF (TBR) + MPH 1 mg/kg/d

30

30

12

Barkley’s Defiant Children: total, inattention, and H/I

N/A

86.02

11.05 (6–18 years)

18.03

Norway

MPH

31

Wang (2007)32

DSM-IV

EEG-NF (TBR) + MPH optimal dose (starting 5 mg/d, max. 30 mg/day)

40

40

20

1.Chinese Conner's behavioral rating scale: total, inattention, and H/I

2.Integrated visual and auditory continuous performance test

Inattention (58.75%)

Combined (32.5%)

H/I (8.75%)

93.685

9.285 (6–16 years)

15

China

MPH

40

  1. ADHD-RS ADHD Rating Scale, ADHD-RS-IV ADHD Rating Scale-IV, d day, DSM-IV diagnostic and statistical manual of mental disorders, fourth edition, DSM-IV-TR diagnostic and statistical manual of mental disorders, fourth edition, text revision, EEG-NF electroencephalographic biofeedback, H/I hyperactivity/impulsivity, ICD-10 International Classification of Diseases, 10th Revision, IQ Intelligence Quotient, MPH methylphenidate, N number, N/A not available, TBR theta/beta ratio.