Table 5:

Statistics

Data structureType of testPower (%)
aGPDNormally distributedOne-way ANOVA6
bGPNNormally distributedOne-way ANOVA20
cTMTNormally distributedOne-way ANOVA8
dGPD RM timeNormally distributedRM ANOVA100
eGPD*groupNormally distributedRM ANOVA9
fGPN RM timeNormally distributedRM ANOVA100
gGPN*groupNormally distributedRM ANOVA13
hTMT RM timeNormally distributedRM ANOVA100
iTMT*groupNormally distributedRM ANOVA9
jΔ GPDNormally distributedOne-way ANOVA9
kΔ GPNNormally distributedOne-way ANOVA13
lΔ TMTNormally distributedOne-way ANOVA15
mΔ GPD (sham and control)Normally distributedOne-way ANOVA81
nΔ GPN (sham and control)Normally distributedOne-way ANOVA99
oΔ TMT (sham and control)Normally distributedOne-way ANOVA12
pCorr allNon-normally distributedPartial Pearson correlation, two-tailed65
qCorr activeNon-normally distributedPartial Pearson correlation, two-tailed25
rRegression allNon-normally distributed*Linear multiple regression97
sRegression activeNon-normally distributed*Linear multiple regression41
  • Lines refer to the alphabetical value provided in the Results section. Post hoc power calculations were performed on the sampled data in G*Power for Windows. For one-way and RM ANOVA, the n and SDs from the data with desired alpha level of 0.05 were used. For the correlation analysis, a hypothetical regression value of 0.03 against a zero correlation were used. For regression analysis, the observed R2 values were used. Deviations from normal distribution in the sample containing all participants were significantly non-normal: head circumference, D(60) = 0.15, p < 0.01; age, D(60) = 0.22, p < 0.01; doses of nicotine in last 2 h before undergoing stimulation, D(60) = 0.33, p < 0.01; doses of caffeine in last 2 h before undergoing stimulation, D(60) = 0.29, p < 0.01; hours awake, D(60) = . , p = 0.02; and hours of sleep, D(60) = 0.15, p < 0.01. Deviations from normal distribution in the sample containing participants from the active group were significantly non-normal: age, D(20) = 0.21, p = 0.02; doses of nicotine in last 2 h before undergoing stimulation, D(20) = 0.40, p < 0.01; doses of caffeine, D(20) = 0.32, p < 0.10; and hours of sleep, D(20) = 0.21, p = 0.02.

  • *The assumptions for regression regarding homoscedasticity, independent errors and normally distributed errors were met.