Classifiction and heterogeneity of preterm birth part 14

Preterm birth 5


Descriptive associations of risk factors have been of a tremendous help in attempting to identify high risk pregnancies for preterm delivery. However the strongest risk factors  (previous preterm birth) is nonexistent for the majority of all preterm births among primiparas. In addition, a substantial proportion of  preterm premature rupture of membranes and spontaneous preterm birth occur without any apparent cause.

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