Risk factors of deep vein thrombosis of lower extremity in patients undergone gynecological laparoscopic surgery: what should we care

Table 3 The variable assignment of multivariate logistic regression

Factors	Variables	Assignment
VTE	Y	Yes = 1, no = 2
Age	X₁	≥ 50 = 1, < 50 = 2
Hypertension	X₂	Yes = 1, No = 2
D-dimer	X₃	≥ 0.5 = 1, < 0.5 = 2
Duration of surgery	X₄	≥ 60 = 1, < 60 = 2
Intraoperative pneumoperitoneum pressure	X₅	≥ 15 = 1, < 15 = 2
Duration of days in bed	X₆	≥ 3 = 1, < 3 = 2

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