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Table 2 Risk factors associated with preterm birth

From: The genomics of preterm birth: from animal models to human studies

Risk factor Relative risk (95% CI) Reference
Ethnicity (African-American) 1.3 (1.0 to 1.6) [75]
Maternal stress 3.3 (1.2 to 9.4) [76]
Maternal age 2.1 (1.3 to 3.6) [77]
Tobacco use 1.3 (1.2 to 1.3) [78]
Surgical intervention for cervical disease 1.3 (1.3 to 1.4) [79]
Genetics: previous preterm birth 5.6 (5.5 to 5.8) [13]
Genetics: maternal family history of preterm birth 1.6 (1.5 to 1.6) [13]
  1. CI, confidence interval.
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