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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.