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Good Positive and Negative Likelihood Ratios

Preterm Labor: Likelihood Ratios

Introduction: Generally defined as birth <37 weeks. See also tests to determine Risk of Preterm Labor. The patients here are symptomatic with labor.

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Tags: Obstetrical Tag this Diagnosis.

Prevalence

Population / CalculatorPrevalence Comments / Study / Link
women hospitalized for preterm labor between 18 and 34 completed weeks' gestation 13.4% for delivery <35wk

Am J Obstet Gynecol. 2006 Jan;194(1):138-43. PMID 16389023

Women with preterm labor 17.1% for delivery within 28 days

Acta Obstet Gynecol Scand. 2002 Jan;81(1):58-63. PMID 11942889

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The likelihood ratios of findings for Preterm Labor are listed below. See the left navigation bar to change the display.

Good Positive and Negative Likelihood Ratios

Finding +LR-LR Comments, Study
Cervical Length Plus fFN
Duplicate Edit
8.60.2

cervical length <=20mm OR length 21-31mm + positive fFN

for delivery within 28 days

Study: Acta Obstet Gynecol Scand. 2002 Jan;81(1):58-63. PMID 11942889

Cervical Length Plus fFN
Duplicate Edit
3.50.4

cervical length <=15mm OR cervical length 16-30mm + fFN >=50ng/ml

for delivery <35wk

in this study, results not significantly different from using fetal fibronectin alone (but saves fFN tests)

Study: Am J Obstet Gynecol. 2006 Jan;194(1):138-43. PMID 16389023

Cervical Length Edit 20.4

cervical length <=25mm

for delivery <35 wk

Study: Am J Obstet Gynecol. 2006 Jan;194(1):138-43. PMID 16389023

Fetal Fibronectin Edit 3.30.5

>=50ng/ml, for delivery <35 wk

Study: Am J Obstet Gynecol. 2006 Jan;194(1):138-43. PMID 16389023