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Uptodate Reference Title
Relative risk of preterm delivery as a function of cervical length
Relative risk of preterm delivery as a function of cervical length
Cervical length (mm)
Percentile
Relative risk of PTD
Confidence interval
≤35
50
2.35
1.42-3.89
≤30
25
3.79
2.32-6.19
≤26
10
6.19
3.84-9.97
≤22
5
9.49
5.95-15.15
≤13
1
13.99
7.89-24.78
Data from an asymptomatic general obstetric population evaluated between 22 and 30 weeks of gestation with exclusion of patients with multiple gestations, fetal anomalies, cerclage, or placenta previa. Relative risk is in comparison to patients whose cervical lengths were above the 75th percentile.
PTD: preterm delivery.
Data from: Iams JD, Goldenberg RL, Meis PJ, et al. The length of the cervix and the risk of spontaneous premature delivery. National Institute of Child Health and Human Development Maternal Fetal Medicine Unit Network. N Engl J Med 1996; 334:567.