Data structure | Type of test | Power (%) | ||
---|---|---|---|---|

a | GPD | Normally distributed | One-way ANOVA | 6 |

b | GPN | Normally distributed | One-way ANOVA | 20 |

c | TMT | Normally distributed | One-way ANOVA | 8 |

d | GPD RM time | Normally distributed | RM ANOVA | 100 |

e | GPD*group | Normally distributed | RM ANOVA | 9 |

f | GPN RM time | Normally distributed | RM ANOVA | 100 |

g | GPN*group | Normally distributed | RM ANOVA | 13 |

h | TMT RM time | Normally distributed | RM ANOVA | 100 |

i | TMT*group | Normally distributed | RM ANOVA | 9 |

j | Δ GPD | Normally distributed | One-way ANOVA | 9 |

k | Δ GPN | Normally distributed | One-way ANOVA | 13 |

l | Δ TMT | Normally distributed | One-way ANOVA | 15 |

m | Δ GPD (sham and control) | Normally distributed | One-way ANOVA | 81 |

n | Δ GPN (sham and control) | Normally distributed | One-way ANOVA | 99 |

o | Δ TMT (sham and control) | Normally distributed | One-way ANOVA | 12 |

p | Corr all | Non-normally distributed | Partial Pearson correlation, two-tailed | 65 |

q | Corr active | Non-normally distributed | Partial Pearson correlation, two-tailed | 25 |

r | Regression all | Non-normally distributed* | Linear multiple regression | 97 |

s | Regression active | Non-normally distributed* | Linear multiple regression | 41 |

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*R*values were used. Deviations from normal distribution in the sample containing all participants were significantly non-normal: head circumference,^{2}*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.