Multiple analysis for cervical length ≤ 25 mm in women with previous pregnancies.

Multiple analysis for cervical length ≤ 25 mm in women with previous pregnancies.</p

The P5 working group.

(DOCX)</p

CL measurement curve line technique.

Transvaginal ultrasonography in sagittal section. The endocervical mucosa (arrow) is used as a guide to identify the internal (IO) and external (EO) os. The curve technique is presented (continue line): two lines are drawn respecting the curvature of the endocervical canal.</p

Multiple analysis for cervical length ≤ 25 mm.

Multiple analysis for cervical length ≤ 25 mm.</p

CL measurement in straight line technique.

Transvaginal ultrasonography in sagittal section. The endocervical mucosa (arrow) is used as a guide to identify the internal (IO) and external (EO) os. The straight-line technique is presented (dashed line).</p

Curve of percentile values for the curve CL measurement.

Curve of percentile values for the curve distance between the internal and external os according to gestational age (weeks) at transvaginal scan.</p

Curve of percentile values for the volume of the uterine cervix according to gestational age (weeks) at transvaginal scan.

Curve of percentile values for the volume of the uterine cervix according to gestational age (weeks) at transvaginal scan.</p

Main sociodemographic characteristics of the sample population, mean, median of the ultrasonographic measurements in straight line of the uterine cervix in millimeters and percentage of cervical length ≤ 25 mm.

Main sociodemographic characteristics of the sample population, mean, median of the ultrasonographic measurements in straight line of the uterine cervix in millimeters and percentage of cervical length ≤ 25 mm.</p

Values of percentile 5, 10, 25, 50, 75, 90 e 95 for the cervical length measurement in linear distance between internal and external os and in curve by ultrasonography according to gestational age.

Values of percentile 5, 10, 25, 50, 75, 90 e 95 for the cervical length measurement in linear distance between internal and external os and in curve by ultrasonography according to gestational age.</p

Inclusion and exclusion flowchart.

Eligible pregnant women, excluded and included in the analysis.</p