[Antenatal surveillance and risks of prematurity and fetal growth retardation]

The essential aim of this work was to investigate the relationship between antenatal care and preterm delivery or low birth weight. This study has been done by means of a case-control survey carried out among 435 women who delivered in 4 Maternity Hospitals in Aix-en-Provence-Pertuis area, between November 20th, 1987 and September 30th, 1988. Cases consisted of 124 women having delivered single livebirths before 37 weeks' gestation and 69 women having delivered, at term, single livebirths weighting less than 2,500 g. Controls were 242 women who delivered normal single livebirths. Results showed that, within the geographic area of the study, low birth weight and preterm delivery rates were respectively 6% and 5.4%. Antenatal care was generally according to medical profession recommendations: average number of visits: 7.9; first visit achieved, for 98.8% of women, within first trimester; intervention of a specialist in 97.1% of pregnancies; average number of ultrasound examinations: 3.5. Only mothers of low birthweight infants had more often an inadequate antenatal care (OR = 2.63, 95% confidence interval: 1.22-5.70). The risk factors for low birth weight were: previous history of preterm and/or low birth weight delivery, single marital status, low lever father's education, smoking during pregnancy, no contact with maternity team and for preterm delivery: previous history of preterm and/or low birth weight delivery, complications during the penultimate pregnancy, hypertension, metrorragies. These results suggest that it seems unlikely, in the future, to decrease unfavorable pregnancy outcomes by increasing antenatal care.