Supplemental Tables: Good Health

Percent calculated from number of births with known obstetric estimate gestational age less than 37 weeks for 2014. Rates pri or to 2014 were calculated from last menstrual period dates.

Orange County Health Care Agency

Percent Preterm (17-36 Com pleted Weeks of Gestation), 2007 to 2016

Note: Percent calculated from number of births with known obstetric estimate gestational ag e less than 37 weeks. 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 Ca lifornia 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 estim ates.

Source: Orange County Health Care Agency

Note: Percent calculated from number of births with known obstetric estimate gestational ag e less than 37 weeks for 2014. Percent calculated from number of births with known gestational age less than 37 weeks for years prior to 2014.

Source: Orange County Health Care Agency