Table 4.

Comparison of quantitative ultrasound-T, Z scores, and stiffness index between the three subgroups of the third-trimester pregnant women and first-trimester pregnant women

	n	Mean±SD	F ratio	P
QUS-T score
First-trimester group all	33	1.05±0.89	29.097	<0.001
Third-trimester group primipara	35	−0.86±0.81
Third-trimester group low parity 1-3	80	−0.64±1.04
Third-trimester group high parity >3	17	−0.82±1.16
Z score
First-trimester group all	33	1.16±0.91	29.963	<0.001
Third-trimester group primipara	35	−0.81±0.81
Third-trimester group low parity 1-3	80	−0.55±1.04
Third-trimester group high parity >3	17	−0.62±1.11
Stiffness index
First-trimester group all	33	113.79±12.49	26.941	<0.001
Third-trimester group primipara	35	87.74±13.96
Third-trimester group low parity 1-3	80	89.08±14.81
Third-trimester group high parity >3	17	87.59±17.17

QUS: Quantitative ultrasound