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;

Changes of maternal serum cortisol and corticosteroid binding globulin levels in idiopathic preterm labor;

Cellular proliferation and apoptosis in placental trophoblast of preterm labor;

Relation of expressions of matrix metalloproteinase (MMP)-9 in human placenta and to preterm labor;

Efficacy of intravenous or atomizing ambroxol for prevention of respiratory distress syndrome in preterm infants;

Analysis of the concentration of plasma copper and collagen in fetal membrane of the preterm s mothers;

Brainstem auditory evoked potentials at different of click stimuli rates in preterm infants;