Visualization of Polypropylene and Polyvinylidene Fluoride Slings in Perineal Ultrasound and Correlation with Clinical Outcome

Table 2

Variances of sling dislocation from resting position during contraction and Valsalva manoeuvre, compared for PP and PVDF by the Ansari-Bradleytest.

Position	Manoeuvre	Variance, PVDF (cm^2)	Variance, PP (cm^2)	P value
Supine position	Contraction	0.005	0.004	0.81
	Valsalva	0.023	0.068	0.08
Upright position	Contraction	0.004	0.036	0.85
	Valsalva	0.005	0.040	<0.03