Table 5.

Spearman rank correlation coefficients between MOS and the measurements made on 3D-TPUS and MRI for the assessment of PFM contraction

Assessment method	Correlation coefficient (rs)	P-value
3D-TPUS
Reduction in LHap diameter, mean (mm)	0.76	<0.001
Reduction in LHap diameter (%)	0.80	<0.001
Reduction in LH area, mean (cm2)	0.67	<0.001
Reduction in LH area (%)	0.60	<0.001
MRI
Reduction in LH area, mean (cm2)	0.66	<0.001
Reduction in LH area (%)	0.70	<0.001
Reduction in LHap diameter, mean (mm)	0.68	<0.001
Reduction in LHap diameter (%)	0.82	<0.001

r-value: r=-1, perfect disagreement; r_s=0, independent ranking; r_s=+1, perfect agreement.

MOS, Modified Oxford Score; 3D-TPUS, 3-dimensional transperineal ultrasound; MRI, magnetic resonance imaging; PFM, pelvic floor muscle; LHap diameter, levator hiatal antero-posterior diameter; LH area, levator hiatal area.