Model of Ment et al for Predicting Relative Risk of Early Onset Germinal Matrix Hemorrhage or Intraventricular Hemorrhage in a Preterm Infant

 

Patient selection: preterm infants weighing from 600 to 1250 grams

 

Parameters:

(1) birthweight in grams

(2) fetal body part at presentation

(3) delivery method

 

Parameter	Finding	Points
fetal presentation	vertex (head)	1
	nonvertex	0
delivery method	cesarean section	0
	vaginal delivery	1

 

where:

• The normative group (relative risk 1.0) was cesarean section delivery of 1100-1250 gram fetus with a non-vertex presentation. The probability for this group was 6%.

 

X =

= (0.666 * (points for delivery method)) + (0.783 * (points for fetal presentation)) - (0.0016 * ((body weight in grams) - 939.5)) - 2.394

 

probability for early onset hemorrhage =

= 1 / (1 + EXP((-1) * X))