Feng and Li et al reported a nomogram for predicting the risk of lower extremity deep vein thrombosis (DVT) in a patient with acute carbon monoxide poisoning. The authors are from Cangzhou Central Hospital in China.
Parameters:
(1) plasma D-dimer concentration in mg/L, from 0 to 10
(2) druation of coma in hours, from 0 to 24
points for D-dimer concentration =
= 10 * (D-Dimer concentration)
points for coma duration =
= 2.054 * (hours)
total score =
= SUM(points for both parameters)
Interpretation:
• minimum score:
• maximum score: 149.3
value of X =
= (0.1733 * (score)) - 5.134
probability of deep vein thrombosis =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.94.
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