Objective To investigate the related risk factors and neonatal outcomes in early preterm birth by analysis of 198 cases of early-to-moderate preterm birth.

Cases were divided into three groups:28～31 +6 gestational weeks as early preterm birth(32/136,23 53%),32～33 +6 gestational weeks as moderate preterm birth group(31/136,22 79%),34～36 gestational weeks as mild preterm birth ones(73/136,53 68%).

Prognostic value of fetus Fibronectin and length of cervix uteri detected by vagina sonography for premature delivery;

Role of infection in development of premature delivery;

Therapeutic efficacy of dexamethasone in antenatal therapy in premature delivery gravidas;

Study on the significance of fetal fibronectin in the prediction and early diagnosis for premature labor;

Clinical observation of oxyephedrine(Anbo) on management of threatened premature labor;

Study of the relationship between serum ferritin and PROM and premature labor;