Clinical Risk Factors for Preterm Birth
نویسندگان
چکیده
1.1 Definitions Preterm birth (PTB) refers to the birth of a baby that occurs before 37 completed weeks of gestation. PTB can be further sub-categorized as late preterm delivery34 to 36 completed weeks gestation, moderately preterm32 to 34 completed weeks, very pretermless than 32 weeks, and extremely pretermless than 28 weeks gestation (Lockwood, et al., 2011). Preterm birth can also be defined by birth weight: low birth weightless than 2500g, very low birth weight1500g, and extremely low birth weightless than 1000g (Lockwood, et al., 2011).
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