Preoperative deep venous thrombosis (DVT) after femoral neck fracture in the elderly, the incidence, timing, location and related risk factors

Table 3 Risk factors associated with DVT, by univariate and multivariate analysis

Variables	Univariate analyses		Multivariate analyses
Variables	Crude OR and 95%CI	P	Adjusted OR and 95%CI	P
Chronic renal insufficiency	2.48 (1.24–5.00)	0.008	3.37 (1.57–7.28)	< 0.001
Current smoking	2.05 (1.17–3.58)	0.011	2.42 (1.29–5.63)	0.004
Delay to DUS (in each day)	1.23 (1.05–1.62)	0.003	1.26 (1.07–1.61)	0.029
Platelet count (> 220*10⁹/L)	2.02 (1.27–3.73)	0.001	1.94 (1.31–3.77)	0.021
Lymphocyte count (< 1.1*10⁹/L)	1.93 (1.16–3.22)	0.011	1.76 (0.89–3.06)	0.097
ALT (> 50 U/L)	2.32 (1.22–4.41)	0.009	1.69 (0.92–4.02)	0.123
AST (> 40 U/L)	2.23 (1.24–3.99)	0.006	1.58 (0.83–3.32)	0.172

Abbreviation: DVT Deep venous thrombosis, DUS Duplex ultrasonography, ALT Alanine transaminase, AST Aspartate transaminase, OR Odd ration, indicates the association intensity of DVT with each variable

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