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Supplemental Tables: Good Health
Percent Preterm for Orange County, California and United States, 2007 to 2016
N/A: Data not available.
Total Preterm Births for California have been updated to match the 2015 March of Dimes Report Card.
Percent calculated from number of births with known obstetric estimate gestational age less than 37 weeks for 2014 and beyond Rates prior to 2014 were calculated from last menstrual cycle dates. Source: Orange County Health Care Agency; March of Dimes Report Card.
Percent calculated from number of births with known gestational age less than 37 weeks.
Note: The primary measure used to determine the gestational age is calculated based on the mother’s last menstrual period (LMP) and the child’s date of birth. In 2007, the obstetric estimate (OE) was added to the California birth certificate to address missing or erroneous LMP data and precludes neonatal assessments. Both rates are shown for 2007-2016 It is anticipated that routine reporting of OE on the birth certificate will improve the accuracy of gestational age estimates.
Source: Orange County Health Care Agency
