Cluster analysis (Ward’s Method), centroids, and variables’ weights
Cluster (C)
n
zP300l
zP300a
zP50r
zDp
zFBP
zWBP
zHR
CTS
SST
BSSW
zMA
1
70
2.85
0.01
0.01
0.13
0.05
0.12
0.10
1.14
0.00
0.00
–0.16
2
58
0.19
–0.25
0.05
–0.09
0.21
2.39
0.12
3.29
1.02
0.00
–0.07
3
25
0.14
0.18
0.08
0.01
0.13
0.29
0.20
1.25
0.04
2.63
–0.07
4
17
0.63
–2.72
–2.29
–0.22
2.09
0.00
0.23
0.00
0.00
0.00
0.19
5
38
0.87
–0.28
0.73
–2.87
2.87
2.01
3.76
0.53
2.19
0.00
–0.09
6
22
1.25
–0.01
0.00
0.1
–0.08
0.16
0.00
0.19
0.00
0.00
3.31
In the first and second columns, the six clusters (expected from the six PCA components with eigenvalues > 1) and the number of children in each cluster. The following columns show the calculated weights of each of the 11 variables from the explained variance in the cluster. The highest values (in bold) indicate the most significant variables defining the cluster. C1: z-scored P300 latency (zP300l); C2: centrotemporal spikes (CTS) and z-scored focal wideband power (zFWBP); C3: bisynchronous spike-wave (BSSW) complexes; C4: z-scored auditory P300 amplitude (zP300a), z-scored auditory P50 ratio (zP50r); and z-scored fast beta power (26–29 Hz sub-band, regional) (zFBP); C5: z-scored delta power [zDP, zFBP, zFWBP, and small sharp transients (SST)]; C6: z-scored maturational asymmetry (zMA). CTS, SST, and BSSW coded by quantity on each record
The authors declare that they have no conflicts of interest.
Ethical approval
The project “Neurophysiological findings in Attention Deficit Hyperactivity Disorder, a Pandora’s box with therapeutic implications” was reviewed and approved by the Ethics Committee of the Hospital Español de México (signed and sealed acceptance letter).
Consent to participate
Informed consent to participate in the study was obtained from all the participants/parents.
Consent to publication
Not applicable.
Availability of data and materials
The raw and analyzed EEG/ERP data and the neuropsychological scores are available on request to the corresponding author to all qualified investigators.
Open Exploration maintains a neutral stance on jurisdictional claims in published institutional affiliations and maps. All opinions expressed in this article are the personal views of the author(s) and do not represent the stance of the editorial team or the publisher.
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