Risk factors for pulmonary infection after thoracoscopic radical resection of lung cancer in elderly patients with diabetes mellitus

Table 4 Risk factors and their assignment for pulmonary infection in patients

Factor	Variable	Assignment
Age	X1	60-69 years old, 0; ≥ 70 years old, 1
TNM stage	X2	I stage, 0; II-III stage, 1
Respiratory diseases	X3	No, 0; Yes, 1
Neoadjuvant chemotherapy	X4	< 2 times, 0; ≥ 2 times, 1
Maximum diameter of tumor	X5	< 4 cm, 0; ≥ 4 cm, 1
Operation time	X6	< 3 hours, 0; ≥ 3 hours, 1
Range of excision	X7	Single leaf, 0; multi leaf, 1
Thoracic drainage tube time	X8	< 3.5 days, 0; ≥ 3.5 days, 1
Forced expiratory volume in one second	X9	≤ 80%, 0; > 80%, 1
Albumin	X10	Actual measurement value
Fasting blood glucose	X11	Actual measurement value
Hemoglobin A1c	X12	Actual measurement value

TNM: Tumor node metastasis.