Table 2.

Results of meta-regression analyses for the incidence of VTE

Variable	No. of studies	Regression coefficient	95%CI	p value
Cancer type	44	− 0.07303	− 0.1515–0.005459	0.07
Age	35	0.2977	− 0.2790–0.8745	0.30
BMI	25	− 0.3630	− 0.1382–0.6557	0.47
ASA	12	0.7075	− 0.3673–1.7822	0.17
Operative time	28	0.001992	− 0.009763–0.004961	0.18
Estimate blood loss	23	− 0.0000864	− 0.001571–0.001399	0.91
Advanced malignancy	27	0.5684	− 0.002252–1.1391	0.051
LN dissection	22	0.3981	− 0.1590–0.9551	0.15
LN yields	16	0.01573	− 0.02128–0.05274	0.38
LOS	25	0.01064	− 0.007443–0.02872	0.24

BMI body mass index, ASA the American Society of Anesthesiology, LN lymph node, LOS length of stay, CI confidence interval