Logistic regression modeling the need for SAE or failing nonoperative management, vs. successful observation: subset of patients with low grade I–III injury and absence of blush and splenic vascular injury (n=258)
| Covariate | OR (95% CI) | P value |
| No HP | 1.0 (Ref) | Ref |
| Small HP | 0.68 (0.22 to 2.06) | 0.49 |
| Moderate HP | 5.55 (2.07 to 14.82) | <0.001 |
| Large HP | 4.88 (1.23 to 19.40) | 0.03 |
| Age (10-unit increase) | 1.40 (1.12 to 1.74) | 0.003 |
| Male sex vs. females | 2.77 (1.03 to 7.40) | 0.04 |
| ISS (10-unit increase) | 1.60 (1.04 to 2.46) | 0.03 |
| Blood type O vs. other | 1.93 (0.85 to 4.36) | 0.12 |
| Abnormal RR vs. RR 12–20 | 1.28 (0.53 to 3.10) | 0.59 |
| Initial hemoglobin <10 | 0.47 (0.11 to 2.08) | 0.32 |
Variables marginally associated in the univariate analysis (p<0.15) were included in the final multivariate logistic regression model. Model fit: AUROC: 0.80; r2=0.28. Bold values denote p<0.05.
AUROC, area under the receiver operating characteristic curve; HP, hemoperitoneum; ISS, injury severity score; SAE, splenic artery embolization.