Using Nonlinear Dynamics and Multivariate Statistics to Analyze EEG Signals of Insomniacs with the Intervention of Superficial Acupuncture

Table 1

Paired t-test results (mean ± SD, n = 30).

Mean ± SD
Electrode	Approximate entropy (ApEn)			Correlation dimension (CD)
	Resting state	Intervention state	Postintervention state	Resting state	Intervention state	Postintervention state
F3	1.73 ± 0.06	1.75 ± 0.05	1.74 ± 0.04	1.06 ± 0.43	1.01 ± 0.42	1.03 ± 0.44
F4	1.74 ± 0.05	1.75 ± 0.04	1.75 ± 0.04	1.12 ± 0.43	1.06 ± 0.42	1.06 ± 0.46
C3	1.75 ± 0.04	1.75 ± 0.04	1.73 ± 0.07	0.97 ± 0.46	0.93 ± 0.43	0.94 ± 0.46
C4	1.75 ± 0.03	1.75 ± 0.04	1.73 ± 0.05	1.00 ± 0.47	0.98 ± 0.43	1.01 ± 0.47
P3	1.75 ± 0.03	1.74 ± 0.03	1.72 ± 0.07	0.92 ± 0.50	0.86 ± 0.47	0.87 ± 0.52
P4	1.71 ± 0.15	1.73 ± 0.05	1.72 ± 0.08	0.82 ± 0.52	0.80 ± 0.46	0.84 ± 0.51
O1	1.73 ± 0.07	1.74 ± 0.04	1.65 ± 0.26	0.90 ± 0.56	0.88 ± 0.48	0.86 ± 0.53
O2	1.75 ± 0.05	1.73 ± 0.08	1.65 ± 0.24	0.87 ± 0.59	0.75 ± 0.50	0.81 ± 0.60
F7	1.73 ± 0.12	1.73 ± 0.14	1.72 ± 0.10	0.78 ± 0.44	0.71 ± 0.40	0.74 ± 0.43
F8	1.75 ± 0.03	1.71 ± 0.17	1.71 ± 0.16	0.84 ± 0.41	0.80 ± 0.41	0.80 ± 0.42
T5	1.74 ± 0.04	1.70 ± 0.20	1.71 ± 0.13	0.58 ± 0.39	0.51 ± 0.32	0.54 ± 0.38
T6	1.74 ± 0.04	1.65 ± 0.36	1.72 ± 0.08	0.57 ± 0.39	0.54 ± 0.36	0.89 ± 0.41
FP1	1.71 ± 0.14	1.71 ± 0.16	1.72 ± 0.11	1.00 ± 0.41	0.95 ± 0.43	0.95 ± 0.41
FP2	1.70 ± 0.33	1.72 ± 0.12	1.74 ± 0.04	1.02 ± 0.46	0.95 ± 0.43	0.97 ± 0.44
T3	1.74 ± 0.05	1.69 ± 0.23	1.74 ± 0.05	0.65 ± 0.40	0.59 ± 0.36	0.59 ± 0.38
T4	1.74 ± 0.05	1.74 ± 0.05	1.72 ± 0.07	0.72 ± 0.39	0.66 ± 0.35	0.71 ± 0.42