Prognostic value of preoperative weight loss-adjusted body mass index on survival after esophagectomy for esophageal squamous cell carcinoma

Table 1 Clinical characteristics of the entire patient cohort

Characteristics	Values
Age in yr	59.8 ± 8.4
Sex
Male	1288 (83.4%)
Female	257 (16.6%)
BMI in kg/m2
< 18.5	212 (13.8%)
18.5-24.9	1144 (74.0%)
25.0-29.9	172 (11.1%)
≥ 30.0	17 (1.1%)
Weight change
Weight stable	986 (63.8%)
Weight loss	559 (36.2%)
Tumor location
Upper	133 (8.6%)
Middle	938 (60.7%)
Lower	386 (25.0%)
Cardia	88 (5.7%)
Histological grade
Well differentiated	57 (3.7%)
Moderately differentiated	625 (40.5%)
Poorly differentiated	789 (51.1%)
Others	74 (4.8%)
T stage
Tis	38 (2.5%)
T1	187 (12.1%)
T2	292 (18.9%)
T3	731 (47.3%)
T4a	297 (19.2%)
N stage
N0	891 (57.7%)
N1	374 (24.2%)
N2	217 (14.0%)
N3	63 (4.1%)
Surgical approach
Sweet	1256 (81.3%)
Ivor-Lewis	146 (9.4%)
McKeown	143 (9.3%)
Lymphovascular invasion
Yes	75 (4.9%)
No	1470 (95.1%)
Adjuvant therapy
Yes	575 (37.2%)
No	970 (62.8%)