Purpose of dating scan
Diagnoses are classified and recorded by the treating physician or midwife according to the International Classification of Diseases (ICD).
The version used during 1973–1978 was ICD-8, while during 1995–2010 the versions were ICD-9 and ICD-10.
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In Sweden, a second trimester scan, using the biparietal diameter (BPD)-measurement for pregnancy dating, is typically performed around gestational week 18 at what time the mean difference (male vs. An introduced bias in the GA estimate, due to size difference by fetal sex at the time of pregnancy dating, would be hypothesized to affect clinical management and neonatal outcomes in the late preterm and early term period.
Although often treated as term, late preterm infants more commonly present with prematurity-related morbidity such as hyperbilirubinemia, respiratory distress syndrome (RDS) of the newborn, transient tachypnea of the newborn, interventions to support breathing, and readmissions for hospital care .
For the purposes of the current study, the period between 19 was not included since policies on the method for pregnancy dating and registration of the US-based EDD were not uniform throughout the country.
The register includes data about maternal socio-demographic characteristics and prospectively collected information during pregnancy, delivery, and the neonatal period (first 28 days) .