17-alphahydroxyprogesterone caproate in women with previous spontaneous preterm delivery: does a previous term delivery affect the rate of recurrence?

In patients who received 17P therapy with 1 previous SPTD, a previous term delivery confers a reduction in risk of preterm delivery at <37, <35, and <32 weeks' gestation; such reduction is not evident with ≥2 previous SPTDs.