Table 3.

Normalized variability of pelvic floor muscle sEMG signal amplitude in the study and control groups

Variability of amplitude (% MVC)
Trial		30s trial		60s trial		90s trial
Group	n	Mean (%)	SD	Mean (%)	SD	Mean (%)	SD
I (20Hz/2mm)	12	2.67	0.63	1.92	0.58	1.59	0.35
II (40Hz/4mm)	10	2.22	0.69	1.73	0.57	1.17	0.25
III (control)	11	2.58	0.37	1.94	0.66	1.39	0.46
pa(I/II/III)		0.23		0.87		0.055
p (I/II)		0.21		0.77		0.043
p (I/III)		0.93		0.99		0.43
p (II/III)		0.36		0.73		0.39

p^a - Friedman’s ANOVA

p - Tukey post hoc test