Table 3.

Associations between hypertension requiring medication and postoperative 30-day mortality according to the original and weighted cohort (IPTW) models.

Variable		Crude model (OR, 95% CI, P)	Model I (OR, 95% CI, P)	Model II (OR, 95% CI, P)
A	Nonhypertension	Ref.	Ref.	Ref.
	Hypertension	2.292 (1.899, 2.766) <0.00001	1.582 (1.292, 1.937) <0.00001	1.392 (1.120, 1.729) 0.00285
B	Nonhypertension	Ref.	Ref.	Ref.
	Hypertension	0.936 (0.831, 1.053) 0.26966	1.066 (0.942, 1.206) 0.31025	1.376 (1.202, 1.576) <0.00001

A, In the original cohort; B, In the weighted cohort (IPTW). Crude model: We did not modify any other variables. Model I: We adjusted for sex, race, and age range. Model II: We adjusted for variables such as sex, ethnicity, age group, body mass index (BMI), hematocrit (HCT), sodium (Na), blood urea nitrogen (BUN), white blood cell count (WBC), creatinine (Cr), platelet count (PLT), duration of surgery, presence of diabetes, smoking habits, year of surgery, overall health condition, severe chronic obstructive pulmonary disease (COPD), congestive heart failure (CHF), presurgical blood transfusions, presence of disseminated cancer, presurgical systemic sepsis, use of steroids for chronic conditions, weight loss exceeding 10% in the past 6 months, bleeding disorders, emergency cases, and wound classification. Hazard ratios (HRs), confidence intervals (CIs), and reference categories (Ref) are the terms used in this context.