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Table 3 Mean and standard error of the P300 latency and amplitude in the female group

From: Change in the P300 index – a pilot randomized controlled trial of low-frequency electrical stimulation of acupuncture points in middle-aged men and women

  

Female(n = 29)

     

Group difference (AS-NS)

p-value

Sham(n = 15)

  

Real(n = 14)

  

Before

After

Difference

Before

After

Difference

Latency of P300 (sec)

Fz

0.31 ± 0.06

0.32 ± 0.07

0.01

0.32 ± 0.07

0.31 ± 0.07

−0.01

−0.02

0.39

Fcz

0.29 ± 0.07

0.29 ± 0.06

0.00

0.32 ± 0.07

0.31 ± 0.07

−0.01

−0.01

0.69

Cz

0.29 ± 0.06

0.28 ± 0.05

−0.01

0.32 ± 0.07

0.32 ± 0.06

0.00

0.01

0.35

Cpz

0.29 ± 0.06

0.28 ± 0.07

−0.01

0.31 ± 0.09

0.32 ± 0.07

0.01

0.02

0.13

Pz

0.32 ± 0.07

0.28 ± 0.07

−0.04

0.31 ± 0.08

0.33 ± 0.07

0.02

0.06

0.05

Amplitude of P300 (μV)

Fz

3.75 ± 1.66

3.34 ± 1.66

−0.41

4.06 ± 2.57

4.83 ± 3.15

0.77

1.18

0.05

Fcz

3.48 ± 1.80

3.17 ± 1.49

−0.31

3.93 ± 2.35

5.09 ± 3.24

1.16

1.47

0.03

Cz

3.30 ± 1.58

3.14 ± 1.56

−0.16

3.64 ± 2.15

4.74 ± 2.86

1.10

1.26

0.04

Cpz

3.14 ± 1.56

2.91 ± 1.62

−0.23

3.49 ± 2.25

4.42 ± 2.51

0.93

1.16

0.04

Pz

2.96 ± 1.53

2.59 ± 1.48

−0.37

3.08 ± 2.02

3.95 ± 2.18

0.87

1.24

0.02

  1. In the female group, the Real group exhibited a significant increase at all five analyzed channels around the parietal lobe: Fz (F = 4.26, p = 0.049), Fcz (F = 5.23 p = 0.031), Cz (F = 4.63, p = 0.041), Cpz (F = 4.94 p = 0.035), and Pz (F = 6.49 p = 0.017) compared with the corresponding values of the Sham group
  2. Italicized data: A significant increase in P300 amplitude