Supplementary table 1. Univariate and multivariate analysis of prognostic factors for overall survival Univariate analysis Multivariate analysis Multivariate analysis Parameter Category Hazard ratio P valu e Hazard ratio P valu e Hazard ratio P valu e (95% CI) (95% CI) (95% CI) Age 1.011 (1.003, 1.018) 0.00 4 1.009 (1.002, 1.017) 0.01 8 1.01 (1.003, 1.018) 0.00 7 Gender Female vs. male 0.927 (0.772, 1.113) 0.41 6 BMI Normal-BMI 1 1 1 Low-BMI 1.405 (1.124, 0.1755) 0.00 3 1.397 (1.115, 1.748) 0.00 4 1.380 (1.102, 1.727) 0.00 5 High-BMI 0.713 (0.550, 0.925) 0.01 1 0.754 (0.580, 0.979) 0.03 4 0.764 (0.588, 0.993) 0.04 4 Hemoglobin (<10 g/dL) Yes vs. no 1.352 (1.310, 1.617) <0.0 01 1.035 (0.858, 1.248) 0.71 8 Albumin (<3.5 g/dL) Yes vs. no 1.572 (1.274, 1.940) <0.0 01 0.899 (0.71, 1.139) 0.37 8 Weight loss ( >10%) Yes vs. no 1.536 (1.293, 1.824) <0.0 01 1.133 (0.945, 1.357) 0.17 8 Severe complications (≥ IIIb) Yes vs. no 3.083 (2.180, 4.358) <0.0 01 1.761 (1.222, 2.538) 0.00 2 1.897 (1.331, 2.705) <0.0 01 Type of gastrectomy Distal 1 1 1 Total 1.875 (1.562, 2.250) <0.0 01 1.299 (0.965, 1.747) 0.08 4 1.249 (1.036, 1.507) 0.02 0 Proximal 1.334 (1.078, 1.652) 0.00 8 1.416 (0.943, 2.126) 0.09 3 1.295 (1.037, 1.619) 0.02 3 Lymphadenectomy D1 1 D1+ 0.726 (0.593, 0.889) 0.00 1 0.993 (0.764, 1.29) 0.95 8 D2 0.803 (0.661, 0.975) 0.02 7 0.954 (0.752, 1.209) 0.69 5 Operation time (≥240 min) Yes vs. no 1.277 (1.086, 1.501) 0.00 3 1.166 (0.979, 1.389) 0.08 4 Blood loss (≥200 ml) Yes vs. no 1.108 (0.927, 1.324) 0.26 2 no. of Lymph nodes Yes vs. no 0.780 (0.646, 0.942) 0.01 0.762 (0.615, 0.944) 0.01 3 0.788 (0.647, 0.959) 0.01 8 retrieved (≥15) Postoperative hospital stay Yes vs. no 1.213 (1.028, 1.430) 0.02 2 1.144 (0.961, 1.361) 0.13 0 (≥10 days)