Relationship between premature labor and maternal age, as well as between premature labor and parity

Various publications of the last years and own studies, too demonstrate that birth rank and maternal age, as well, in each case independently influence the risk of prematurity. The rate of prematurity for primiparous and multiparous women is above the average; it is just the same for very young and comparatively old women. Basing on a review of literature eventual causes are briefly discussed.