Table 3.
Risk factors for transfusion after primary total knee arthroplasty at our institution, 2010
| Variable | OR | 95 % CI | P value |
|---|---|---|---|
| ASA | |||
| I–II | 1 | ||
| III | 1.7 | 1.0–2.9 | 0.031 |
| Hb preop | |||
| >13 | 1 | ||
| 12–13 | 2.9 | 1.6–5.4 | 0.001 |
| <12 | 4.7 | 2.0–10.6 | 0.000 |
| Obesity | |||
| Obesity III | 1 | ||
| Obesity I–II | 0.7 | 0.3–1.5 | 0.354 |
| Normal–preobesity | 1.9 | 1.0–3.6 | 0.035 |
| Gender | |||
| Male | 1 | ||
| Female | 1.4 | 0.7–2.6 | 0.300 |
| Age | 0.98 | 0.9–1.0 | 0.501 |
ASA American Society of Anesthesiologists, preop. pre-operatively, OR odds ration; CI confidence interval; Hb haemoglobin
Adjusted model: pseudo-R 2 (pR2) = 0.09, p < 0.001