Predicting short-term thromboembolic risk following Roux-en-Y gastric bypass using supervised machine learning

Table 1 Baseline characteristic and clinical outcomes of included patients

Factor	Value
N	6526
Postoperative VTE within 30 d (%)	49 (0.8)
Age, median (IQR)	44 (36.1, 52.81)
Age > 50 yr (%)	2083 (31.9)
Female gender (%)	5282 (80.9)
Preop GERD requiring medication (%)	2477 (38.0)
Preop history of MI (%)	67 (1.0)
Previous PCI (%)	140 (2.1)
Previous cardiac surgery (%)	48 (0.7)
Preop hypertensive requiring medication (%)	3340 (51.2)
Preop hyperlipidemia (%)	1691 (25.9)
Preop weight closest to bariatric surgery, median (IQR)	287 (256, 329)
Preop BMI closest to bariatric surgery, median (IQR)	47.61 (44.26, 51.75)
Preop vein thrombosis (%)	128 (2.0)
Preop venous stasis (%)	195 (3.0)
Preop requiring or on dialysis (%)	7 (0.1)
Preop renal insufficiency/CKD (%)	56 (0.9)
Preop therapeutic anticoagulation (%)	201 (3.1)
Previous foregut surgery (%)	710 (10.9)
Current smoker within 1 yr (%)	546 (8.4)
Preop history of COPD (%)	126 (1.9)
Preop obstructive sleep apnea	3196 (49.0)
Preop steroid/immunosuppressant use for chronic condition (%)	113 (1.7)
Preop history of IVC filter placement (%)	25 (0.4)
Preop history of DM (%)	2009 (30.8)
Preop albumin (g/dL), median (IQR)	3.9 (3.4, 4.2)
Preop serum creatinine (mg/dL), median (IQR)	0.77 (0.69, 0.85)
Preop hematocrit (%), median (IQR)	40.3 (37.7, 42.8)
Preop hemoglobin A1c > 7%	741 (11.4)

VTE: Venous thromboembolism; Preop: Preoperative; GERD: Gastroesophageal reflux disease; MI: Myocardial infarction; PCI: Primary coronary intervention; CKD: Chronic kidney disease; COPD: Chronic obstructive pulmonary disease; IVC: Inferior vena cava; DM: Diabetes mellitus.