A total of 1026 cases of toxemia of pregnancy were chosen from some 1500 cases collected in cooperation with many hospital and medical facilities in Japan, and examined for the purpose of devising an appropriate scoring system for toxemia of pregnancy.
The toxemia of pregnancy was evaluated by two prognosis ; the maternal prognosis being the incidence of persistent hypertension (PHT) at one month after delivery, the other, the fetal prognosis, being the incidence of IUGR.
In order to research the reciprocal correlations among the factors, cluster analysis, principal component analysis and multiple regression analysis, that is, multivariable analysis, were carried out.
1) The single linkage method was used for cluster analysis. This analysis indicates that edema and edema duration exist in a cluster which is quite different from the other clusters.
2) To adjust the space relation among the factors, principal component analysis was carried out.
3) In multiple regression analysis, fetal body weight, fetal height and persistent hypertension were studied. When parameters were chosen from the view point of the contribution rate, diastolic pressure found to have the highest effect on fetal body weight, followed by proteinuria and diastolic hypertension duration, respectively. The factors having the most effect upon fetal height were diastolic pressure, systolic pressure, diastolic hypertension duration and proteinuria, in order of importance. In the case of persistent hypertension, the order of contribution was seen to be systolic pressure, systolic hypertension duration and diastolic hypertension duration. However, edema was found to contribute little to IUGR and PHT.
4) The correlations between the incidence of IUGR and S-Du, D-Du or P-Du were significant. However, there was no significant correlation between the incidence of IUGR and E-Du.
The incidence of PHT correlated significantly to S-Du and D-Du, but not to P-Du and E-Du.
View full abstract