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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.

Pre-Test Probability (Prevalence): %. Post-Test Probability (Predictive Value): %. Switch to display mode.
**Note that calculating probabilities from more than one finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)
Good Positive and Negative Likelihood Ratios
FindingResult +LR-LR
[ + ] Cervical Length Plus fFN + 0 - 8.60.2
[ + ] Cervical Length Plus fFN + 0 - 3.50.4
[ + ] Cervical Length + 0 - 20.4
[ + ] Fetal Fibronectin + 0 - 3.30.5