Table 2 Independent t-Tests Between Active and Sham-tDCS + WMT Groups for the Differences (Deltas) of Cognitive Scores from Pre to Post-Treatment (n = 39).

From: Cognitive effects of transcranial direct current stimulation combined with working memory training in fibromyalgia: a randomized clinical trial

Cognitive Measures

Active-tDCS + WMT (n = 19) M(SD)

Sham-tDCS + WMT (n = 20) M(SD)

Between-groups P values for Δs

Pre-treatment

Pos-treatment

Delta (Δ)

Pre-treatment

Pos-treatment

Delta (Δ)

Δ COWAT Orthographic

28.80(11.24)

34.05(9.65)

23.46(27.94)

31.30(10.88)

34.31(11.88)

10.74(19.70)

0.11

Δ COWAT Semantic

16.80(6.07)

18.90(5.85)

14.08(23.78)

17.55(5.66)

17.26(5.15)

0.95(16.32)

0.52

Δ RAVLT A1

6.50(1.67)

9.20(2.56)

45.55(40.60)

6.80(2.09)

8.26(1.96)

25.52(35.96)

0.11

Δ RAVLT A1_A5

50.10(10.29)

58.40(8.74)

17.30(15.01)

45.70(10.15)

53.26(9.21)

18.03(15.33)

0.88

Δ RAVLT A7

9.65(2.88)

12.20(2.30)

28.37(23.67)

8.70(2.57)

10.94(2.73)

25.23(24.13)

0.68

Δ RAVLT Recognition

13.30(1.78)

14.10(1.20)

6.17(13.21)

13.50(1.27)

13.89(1.41)

2.72(10.75)

0.37

Δ PASAT

28.73(13.04)

33.50(12.61)

18.42(26.93)

28.15(11.30)

32.72(12.10)

18.21

0.98

Δ FDS

6.90(1.74)

6.45(1.50)

−4.39(18.29)

6.90(2.29)

6.00(1.69)

−9.62

0.45

Δ BDS

4.60(1.35)

5.05(1.82)

15.66(49.17)

4.30(1.62)

4.73(2.02)

12.36(39.61)

0.81

  1. Data presented as mean (M) and standard deviation (SD).
  2. Notes. Δ = deltas; COWAT = Controlled Word Association Test; PASAT = Paced Auditory Serial Addiction Test; RAVLT = Rey Auditory Verbal Learning Test; FDS = Forward Digit Span; BDS = Backward Digit Span. P-value is the comparison of the deltas. Significance level was P < 0.05.
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