Equations at 30 Days of Life
factor at an age of 30 days =
= (-5.952) + (0.4538 * (mean airway pressure in cm H2O at 30 days))
factor at an age of 30 days incorporating sepsis =
= (-6.510) + (0.4588 * (mean airway pressure in cm H2O at days)) + (1.475 * (documented sepsis episodes))
where
• documented sepsis episodes = 1 if there were any documented episodes of sepsis during the first month of life, or 0 if there were no documented episodes
probability of mortality at 30 days =
= 1 / (1 + EXP((-1) * (factor)))
Equations at 60 Days of Life
factor at 60 days of age =
= (-7.668) + (0.2940 * (mean airway pressure in cm H2O at 60 days)) + (5.935 * (FIO2 at 60 days of age))
where
• FIO2 is the fractional inspiratory oxygen (ranging from room air at 0.21 to 1.00 at 100% oxygen)
probability of mortality at 60 days =
= 1 / (1 + EXP((-1) * (factor)))
