A multicenter study of the biometric parameters of Tuscan newborns

: We combined data concerning weight, length, chest's perimeter and head's circumference of newborns of 16 Tuscan hospitals on 1985, with sample of 4,215 boys and 4,119 girls, from 33.th to 42.th gestational week. These data have been statistically elaborated to obtain values of the four considered parameters and the respective standard deviation. For the distribution of the 16 hospital in the region, we think that these data are representatives of Tuscan newborn's reality. We have moreover considered whether data of Tuscan newborns, with parents proceeding from different regions, were dissimilar from those with autochthonous parents. The statistical comparison of the two reality, with "T-Student's test', is resulted not significant. We calculated then values of the four parameters with their standard deviation, for each hospital participating to the research, excluding groups with to small numerousness, i.e. 33rd, 34th, 35th and 42nd gestational week. Besides, we valued if data of each Hospital were statistically different from those related to the whole Tuscan sample. The results of this testing, performed with "T-Student's test", are illustrated in the schedules. The differences seem to be referred to local conditions, that will be object of new researches. At present, we can only emphasize that the chest's perimeter is the parameter with the larger variability, so that we will exclude this size from the next research.