Li et al reported a nomogram for predicting the risk of surgical site infection after clean orthopedic surgery. The authors are from Xingtai General Hospital, Hebei Medical University, and North China Healthcare Group.
Patient selection: status post clean orthopedic surgery
Parameters:
(1) surgical time in minutes
(2) plasma D-dimer in µg/mL
(3) ASA grade, from 1 to 3
points for surgery time =
= 0.2711 * (time)
points for D-dimer =
= 2.222 * (D-dimer concentration)
Parameter
Finding
Points
ASA status
1
0
2
18.7
3
37.4
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 232.3
value of X =
= (0.04976 * (score)) - 4.582
risk of surgical site infection =
= 1 / ( 1+ EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.78 in the training and 0.73 in the validation cohorts.
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