The overall Tulsa County birth rate decreased 9% for teens, aged 15-19 between 2017 and 2018, outpacing the national decrease of only 7%, according to the final 2018 birth data released by the Oklahoma State Department of Health. Tulsa County’s birth rate for school-aged teens, 15-17, decreased by 25% from 2017 to 2018; the birth rate decreased by 4% for older teens, aged 18-19. (Rates are the number of births per 1,000 females of the same age range.)