Table 2.

Correlation coefficients with mean SWS.

	Univariate analysis		Multivariate analysis
	Correlation coefficient with mean shear wave speed (95% CI)	p	Correlation coefficient with mean shear wave speed (95% CI)a	p
Maternal age	− 0.01 [− 0.06; 0.04]	0.67
Gestational age	0.002 [− 0.22; 0.23]	0.98
BMI	− 0.08 [− 0.12; 0.03]	< 0.001	− 0.05 [− 0.13; 0.02]	0.10
Depth of measurement	− 0.50 [− 0.67; − 0.33]	< 0.001	− 0.18 [− 0.50; 0.13]	0.27
Labor duration	− 0.04 [− 0.09; 0.002]	0.05	0.04 [− 0.04; 0.11]	0.55
Duration passive 2nd stage	− 0.98 [− 0.23; 0.03]	0.13	0.02 [− 0.02; 0.05]	0.64
Duration active 2nd stage	− 0.18 [− 0.79; 0.42]	0.55
Duration 3rd stage	− 0.56 [− 1.18; 0.06]	0.07	− 0.40 [− 1.32; 0.53]	0.67
Units of oxytocin	− 0.20 [− 0.35; − 0.05]	0.008	− 0.34 [− 0.62; − 0.05]	0.03
Total blood loss	− 0.27 [− 0.35; − 0.19]	< 0.001	− 0.26 [− 0.41; − 0.11]	< 0.001
Newborn weight	− 0.05 [− 0.08;− 0.01]	0.005	− 0.08 [− 0.12; − 0.03]	0.001

BMI body mass index, CI confidence interval.

^aAdjusted for body mass index, depth of measurement, labor duration, duration passive 2nd stage, duration 3rd stage, units of oxytocin, total blood and newborn weight.