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We chose 35 maternal characteristics which were known to favor a premature delivery or the birth of an infam weighing less than 2500g. Some of thesc characteristics are oftencitedintheliterature,othersare of our own selection [7]. These characteristics are grouped in series of comparable signs (social data, weight, height. .., unfavorable obstetrical or gynecological antecedents, factors of fatigue, signs of danger at examination, signs of threat of imminent delivery). We assigned to each of the characteristics a number of points varying from l to 5 according to their assumed importance. The sum of the points corresponding to the characteristics present in a pregnant woman provides the Empirical Coefficient of Risk of Premature delivery: E. C. R. P. [1] at the time of the examination. The study was made on a risk group (153 mothers of all babies weighing less than 2500g and born at "Maternite de Port-Royal" in 1969: Group R) and a control group (222 cases of mothers of infants weighing more than 2500g born during the same year at the same hospital and chosen at random: Group C). We wanted to assess the risk by a single examination, and we chose as an Optimum date 32 weeks of gestation from the first day of the last menstruation. The Information was taken from the routine prenatal care records filled in during the examination and transcribed after the delivery onto our special forms. Our study deals with the statistical results of the prediction of risk by the empirical method and then attempts an improvement using a discriminant analysis. We decided to register the signs occurring at the examination closest to the 32nd week. As many women were sent to "Maternite de Port-Royal" from the whole Curriculum vitae

Multifactorial study of the risk of prematurity at 32 weeks of gestation. II. A comparison between an empirical prediction and a discriminant analysis