Table 3.

Summary of the statistical tests.

(a) Pre-stim impedance decay: repeated-measures ANOVA
Weeks	F(26, 10 140) = 101.09, p < 0.01
Weeks × charge per phase	F(52, 10 140) = 1.95, p < 0.01
Weeks × duty cycle	F(26, 10 140) = 0.56, p > 0.05
Weeks × interval duration	F(26, 10 140) = 2.43, p < 0.01
Weeks × interval duration (4 nC/phase only)	F(26, 3198) = 4.28, p < 0.01
(b) Pre-stim impedance total decay: univariate ANOVA
Stimulation condition (week 1–28)	F(4, 290) = 5.16, p < 0.01
Stimulation condition (week 14–28)	F(4, 290) = 1.27, p > 0.05
(c) Impedance drop: repeated-measures ANOVA
Pre- versus post-stim levels	F(1, 302) = 272.38, p < 0.01
(d) Impedance drop: univariate ANOVA
Stimulation condition (week 1)	F(4, 303) = 41.50, p < 0.01
Stimulation condition (week 14)	F(4, 303) = 4.09, p < 0.01
Stimulation condition (week 28)	F(4, 303) = 5.84, p < 0.01
(e) Pre-stim voltage excursion decay: repeated-measures ANOVA
Weeks	F(13, 5070) = 5.58, p < 0.01
Weeks × charge per phase	F(26, 5070) = 1.99, p < 0.01
Weeks × duty cycle	F(13, 5070) = 1.08, p > 0.05
Weeks × interval duration	F(13, 5070) = 2.62, p < 0.01
(f) Pre-stim voltage excursion total decay: univariate ANOVA
Stimulation condition	F(4, 373) = 6.07, p < 0.01
(g) Voltage excursion drop: repeated-measures ANOVA
Pre- versus post-stim levels	F(1, 390) = 98.32, p < 0.01
(h) Voltage excursion drop: univariate ANOVA
Stimulation condition (week 14)	F(4, 360) = 88.36, p < 0.01
Stimulation condition (week 28)	F(4, 374) = 65.95, p < 0.01