The expected survival in a low birthweight neonate can be estimated from clinical findings shortly after birth. The survival estimate is intended to be more accurate than the Apgar score alone.
Patient population: Premature infants weighing 500 to 1,800 grams.
Parameter
Finding
Value
number in family
(siblings) + (parents)
RDS value
respiratory distress present
1
respiratory distress absent
0
prenatal ultrasound value
ultrasound performed
1
ultrasound not performed
0
premature labor value
spontaneous premature labor present
1
spontaneous premature labor absent
0
birthweight AGA value
birthweight appropriate for gestational age
1
birthweight not appropriate for gestational age
0
convulsion value
present
1
absent
0
A =
= 10.9755 - (0.0024 * (birthweight in grams)) - (0.3077 * (number in family)) + (1.9809 * (RDS value)) - (1.3486 * (prenatal ultrasound value)) + (1.333 * (premature labor value)) - (1.2490 * (birthweight AGA value)) + (3.446 * (convulsion value)) - (0.2617 * (gestational age in weeks)) - (0.1807 * (1 minute Apgar score))
neonatal survival index =
= 1 / (1 + EXP(A))
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