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Table 4 Current use of cerclage and minimum prolongation of pregnancy required to introduce prophylactic cerclage into practice

From: Is it possible to estimate the minimal clinically important treatment effect needed to change practice in preterm birth prevention? Results of an obstetrician survey used to support the design of a trial

  Current use of cerclage
Prolongation of pregnancy
required to change practice
Use cerclage
(n = 308)
Do not use cerclage
(n = 174)
1 week 44 (14.3%) 15 (8.6%)
2 weeks 86 (27.9%) 36 (20.7%)
3 weeks 178 (57.8%) 123 (70.7%)