Table 2. Forward stepwise logistic regression analysis of potential risk factors for symptomatic post-operative pulmonary embolism.

Variable	OR	95% CI	P value
Female	86.921	4.242–1,781.124	0.004
Age	1.078	1.005–1.156	0.035
LOS before surgery	1.124	1.040–1.214	0.003
Operative time (min)	1.013	1.002–1.025	0.024
Intra-operative blood transfusion	80.669	3.312–1,964.641	0.007

LOS, length of stay; OR, odds ratios; CI, confidence intervals.