Manktelow et al reported a model for predicting survival of a very premature infant. The authors are from the University of Leicester in the UK.
Patient selection: white singleton infant born before 33 0/7 weeks gestation
Parameters:
(1) weeks of gestation at birth (with days expressed as a fraction per week)
(2) birthweight in kilograms
(3) gender
(4) birth before 24 0/7 weeks
|
Parameter
|
Finding
|
Points
|
|
weeks gestation
|
|
0.46 * (weeks)
|
|
birthweight
|
|
-0.47 / ((birthweight)^2)
|
|
gender
|
male
|
0
|
|
|
female
|
0.45
|
|
birth before 24 0/7 weeks
|
no
|
0
|
|
|
yes
|
-0.28
|
value of X =
= SUM(points for the parameters) - 10.28
probability of survival =
= 1 / (1 + EXP((-1) * X))
