Construction of a risk prediction model for postoperative cognitive dysfunction in colorectal cancer patients

Table 4 Assignment method

Factors	Assignment
Diabetes	1: Presence; 0: Absence
Alcohol consumption	1: Presence; 0: Absence
Years of education	1: ≥ 10 years; 0: < 10 years
Anesthesia duration	1: ≥ 4 hours; 0: < 4 hours
Intraoperative blood loss	1: ≥ 300 mL; 0: < 300 mL
Intraoperative hypoxemia	1: Presence; 0: Absence
Intraoperative use of DEX	1: Absence; 0: Presence
Surgical time	1: ≥ 90 minutes; 0: < 90 minutes
Intraoperative use of vasoactive drugs	1: Absence; 0: Presence
SIRS score	1: ≥ 3 points; 0: < 3 points

DEX: Dexmedetomidine; SIRS: Systemic inflammatory response syndrome.