Table 5.

Comparison between three subgroups of third trimester regarding Quantitative ultrasound-T, Z score and stiffness index

QUS scores	Patient subgroups	Mean difference	SE	P	95% CI
					Lower limit	Upper limit
QUS-T score
Third-trimester primipara	Third-trimester low parity 1-3	−0.221	0.199	1.000	−0.752	0.310
	Third-trimester high parity >3	−0.042	0.290	1.000	−0.817	0.732
Third-trimester parity 1-3	Third-trimester high parity >3	0.179	0.262	1.000	−0.521	0.879
Z score
Third-trimester primipara	Third-trimester low parity 1-3	−0.257	0.198	1.000	−0.786	0.272
	Third-trimester high parity >3	−0.185	0.289	1.000	−0.957	0.587
Third-trimester parity 1-3	Third-trimester high parity >3	0.072	0.261	1.000	−0.625	0.769
SI
Third-trimester primipara	Third-trimester low parity 1-3	−1.332	2.931	1.000	−9.161	6.497
	Third-trimester high parity >3	0.155	4.275	1.000	−11.265	11.575
Third-trimester parity 1-3	Third-trimester high parity >3	1.487	3.862	1.000	−8.830	11.803

Bonferroni pairwise post hoc test for comparison between subgroups of third-trimester participants was used. SI: Stiffness index, CI: Confidence interval, QUS: Quantitative ultrasound, SE: Standard error