Kurz et al identified risk factors for surgical site infection following colorectal surgery. This includes an evaluation of the effect of perioperative body temperature. The authors are from the Study of Wound Infection and Temperature Group.
Parameters:
(1) tobacco use
(2) body temperature
(3) surgical site
(4) National Nosocomial Infection Surveillance (NNIS) System (see above)
(5) age of the patient in years
Parameters
Finding
Odds Ratio
tobacco use
no
1
yes
10.5
body temperature
normal
1
hypothermia
4.9
surgical site
colon
1
rectum
2.7
NNIS
0
1
1
2.5
2
5.0
3
7.5
age in years
per decade
1.6 * (age) / 10
where:
• The NNIS score is based on the ASA preoperative assessment, relative duration of the procedure, and surgical wound class (clean or clean-contaminated vs contaminated or dirty), as described above.
• Age can be handled as a continuous variable, rounded to the nearest decade or rounded down.
Interpretation:
• This data could be used in 2 ways: (1) cumulative product of the odds ratios for each parameter or (2) summation of odds ratio.
• The maximal cumulative product would be around 16,670. A patient's product could be expressed as a percent of this maximum.
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