Lower Boundary Line
y intercept at 20 weeks: 0.30
y intercept at 42 weeks: 0.07
slope of line: -0.0104
LOG10(100 * ((? OD455) - (? OD575))) =
= ((-0.0104) * (weeks gestation)) + 0.509
Upper Boundary Line for < 32 Weeks
for less than 32 weeks, y = 0.5
Upper Boundary Line for 32 - 42 Weeks
y intercept at 42 weeks: 0.23
y intercept at 20 weeks (if the line were extrapolated back): 1.0
slope = -0.035
LOG10(100 * ((? OD455) - (?OD575))) =
= ((-0.035) * (weeks gestation)) + 1.7
where:
• Logarithms are base 10.
• The weeks gestation are from 20-42 weeks.
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Location
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Interpretation
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above zone
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intrauterine or neonatal death
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within zone
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overlap (indeterminate)
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below zone
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surviving infants
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