Yanjun et al reported a nomogram for predicting an incisional surgical site infection following radical resection of a bladder cancer. The authors are from Peking Union Medical College, Peking University and the Chinese Academy of Medical Sciences.
Patient selection: status post radical cystectomy for bladder cancer
Parameters:
(1) age in years
(2) body mass index (BMI) in kg per sq m
(3) diabetes
(4) ICU
(5) operation duration in hours
Parameter
Finding
Points
age in years
< 60 years
6.23
>= 60 years
0
BMI
< 18.5 kg per sq m
0
18.5 to 27.9
6.85
>= 28 kg per sq m
0
diabetes
no
0
yes
8.58
ICU
no
0
yes
10
operation duration
< 2 hours
5.76
>= 2 hours
0
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 37.41
value of X =
= (0.1481 * (score)) - 4.969
probability of wound infection =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.79.
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