Table 2.

Description of central tendency data, dispersion and extremes of groups CND, CII and CA, collected pre and post intervention.

Children with Cognitive Development Normal (CND)
	Alpha Waves				SMR Waves
	Average Activity		Coefficient of Variation		Average Activity		Coefficient of Variation
	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention
Minimum	1.31	3.68	0.48	1.29	1.67	2.82	0.35	1.13
Maximum	13.54	21.26	11.36	4.56	10.68	13.95	9.43	5.81
Median	3.67	10.02	2.78	1.39	3.16	8.33	1.01	1.27
Standard Deviation	4.13	6.66	3.74	1.18	3.45	3.60	3.05	1.61
Children with Intellectual Impairment (CII)
	Alpha Waves				SMR Waves
	Average Activity		Coefficient of Variation		Average Activity		Coefficient of Variation
	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention
Minimum	5.47	7.35	0.41	0.38	3.13	4.43	0.35	0.38
Maximum	36.13	42.85	0.63	0.5	29.01	30.05	0.63	0.79
Median	21.31	24.69	0.46	0.43	16.04	17.99	0.46	0.44
Standard Deviation	9.21	13.59	0.072	0.042	8.98	9.81	0.09	0.11
Children with Autism Diagnosis (CA)
	Alpha waves				SMR waves
	Average Activity		Coefficient of Variation		Average Activity		Coefficient of Variation
	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention	Pre Intervention	Post Intervention
Minimum	2.83	5.06	0.39	0.44	1.66	2.57	0.30	0.43
Maximum	39.18	48.74	0.88	1.48	31.80	40.92	0.83	1.33
Median	7.49	8.49	0.49	1.05	13.02	6.57	0.46	1.03
Standard Deviation	16.00	16.20	0.18	0.33	12.40	14.56	0.20	0.32