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Fig. 1 | BMC Pregnancy and Childbirth

Fig. 1

From: Evaluation of a two-tier preterm birth prevention service in a tertiary hospital in the United Kingdom: a retrospective cohort study

Fig. 1

Risk factors for preterm birth. Percentage of women from the different cohorts having major risk factors (A), moderate risk factors (B) or a combination of risk factors (C). Risk factors are not mutually exclusive. The major risk factor of a short cervix (< 25 mm) refers to the time of the first clinic visit for women who attended the Preterm Birth Clinic or the Screening Clinic. Asterix (*) indicates a significant difference between the Preterm Birth Clinic and Screening Clinic with p < 0.01. Abbreviations: 32/40 = 32 weeks’ gestation, CS = caesarean section, LLETZ = Large Loop Excision of the Transformation Zone, PPROM = preterm prelabour rupture of membranes, Prev = previous, PTB = preterm birth

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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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