*3.2. Univariate Analysis*

To identify possible confounders and the relationship between admission hematocrit level and preoperative DVT, we performed a univariate analysis (Table 2). According to the criteria of *p* < 0.1, the following variables were considered in the multivariate logistic regression: sex, dementia, and multiple injuries.


**Table 2.** Effects of factors on preoperative DVT measured by univariate analysis (N = 1840).


**Table 2.** *Cont.*
