Table 2 Multivariable Model and Risk Factors Associated with Intraoperative Hypothermia (OR, 95% Confidence Interval).
Risk Factors | Derivation Cohort (n = 3132) | Validation Cohort (n = 830) |
|---|---|---|
Age | ||
<=65 | reference | reference |
>65 | 1.04(0.64–1.69) | 0.72(0.42–1.23) |
Gender | ||
Male | reference | reference |
Female | 0.73(0.49–1.09) | 0.76(0.53–1.09) |
ASA | ||
<3 | reference | reference |
≥3 | 0.79(0.42–1.47) | 1.01 (0.55–1.87) |
Magnitude of Surgery | ||
Minor/Intermediate Surgery | reference | reference |
Major & Major + Surgery | 1.98(1.25–3.13) | 1.93(1.27–2.95) |
Anesthesia | ||
General Anesthesia alone | reference | reference |
Anesthesia (combined) | 1.69(0.71–4.01) | 1.84 (0.85–3.99) |
IV fluid replacement (>1000 ml) | ||
≤1000 ml | reference | reference |
>1000 ml | 2.54(1.48–4.37) | 2.78 (1.74–4.46) |
Intraoperative irrigation | ||
≤500 ml | reference | reference |
>500 ml | 1.30(1.10–1.54) | 0.73 (0.47–1.15) |
Duration of Anesthesia | ||
≤2 h | reference | reference |
>2 h | 2.07(1.37–3.12) | 3.284 (1.81–5.95) |
Endoscopic Surgery | ||
yes | reference | reference |
no | 1.36(0.92–1.99) | 0.76 (0.53–1.09) |
Patient Warming | ||
passive warming | reference | reference |
active warming | 0.36(0.19–0.66) | 0.44 (0.25–0.78) |
Baseline core temperature before anesthesia (C°) | 0.07(0.03–0.14) | 0.075 (0.04–0.13) |
BMI | ||
> =25 | reference | reference |
<25 | 0.42(0.29–0.61) | 0.39 (0.28–0.56) |
OR ambient temperature (C°) | 0.87(0.77–0.98) | 0.88 (0.79–0.98) |
