Mothers older than 35 years of age, smoking, drinking, premature rupture of membranes, vaginal bleeding, pregnancy-induced hypertension, multiple births, the number of prenatal care, the father smoking and educational level, family income and other factors and preterm low birth weight the occurrence

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The mother age is bigger than 35 year old of, smoking drinks wine, the fetal membrane broken, the vagina bleeds early, the hypertension of pregnancy synthesizes drafts, the polyembryony, the prenatal examination number of times, factors and so on father smoking and cultural level, household income w

Mother is greater than 35 years of age, smoking and drinking, prelabour rupture of membranes, vaginal bleeding, pregnancy-induced hypertension syndrome, multiple births, number of visits, smoking father and literacy, household income and other factors associated with preterm low birth weight infants