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Good Positive and Negative Likelihood Ratios

Good Positive Likelihood Ratio

Risk of Preterm Labor: Likelihood Ratios

Introduction: These tests are for prediction of likelihood of going into preterm labor. In other words, these patients are asymptomatic. For patients who are symptomatic, see Preterm Labor.

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Prevalence

Population / CalculatorPrevalence Comments / Study / Link
Women in the U.S. 12% approximately... from March of Dimes numbers
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The likelihood ratios of findings for Risk of 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
Duplicate Edit
3.50.4

shortest cervical length q2wk up to 24 weeks is <25mm, for birth <35 wk

in women with h/o spon preterm birth

Study: JAMA 2001 Sep 19;286(11):1340-8. PMID 11560539

Good Positive Likelihood Ratio

Finding +LR-LR Comments, Study
Cervical Length
Duplicate Edit
9.50.8

<25mm at 16-19wk, for birth <35wk

in women with h/o spon preterm birth

Study: JAMA 2001 Sep 19;286(11):1340-8. PMID 11560539