Preoperative anemia and deep vein thrombosis in patients with perioperative bone trauma: a cohort study

Table 5 Associations between the anemic and Nonanemic patient in the crude analysis, multivariable analysis, and propensity-score analyses

Analysis	The incidence of DVT (%)	P-value
No. of events/no. of patients at risk (%)
Non anemia	76/366 (20.77)
Anemia	109/335 (30.70)
Crude analysis — hazard ratio (95% CI)	1.56 (1.22–2.02)	< 0.001
Multivariable analysis — hazard ratio (95% CI)^a	1.36 (1.05–1.74)	0.018
With inverse probability weighting, IPTW^b	1.63 (1.15–2.29)	0.006
Adjusted for propensity score^c	1.50 (1.11–2.04)	0.009
With standardized mortality ratio weighting, SMRW^d	1.8 (1.28–2.51)	0.001

^aShown is the hazard ratio from the multivariable logistic regression model, with adjusted for all covariates
^bShown is the primary analysis with a hazard ratio from the multivariable logistic regression model with the same strata and covariates with inverse probability weighting according to the propensity score
^cShown is the hazard ratio from a multivariable logistic regression model with the same strata and covariates with matching according to the propensity score. The analysis included 258 patients (258 were anemic and 258 were non-anemic before surgery)
^dhown is the hazard ratio from a multivariable logistic regression model with the same strata and covariates, with additional standardized mortality ratio weighting

ISSN: 1471-2474