Risk of anemia in morbidly obese patients after bariatric surgery in Taiwan

Table 4 Cox model with hazard ratio and 95% confidence intervals of anemia associated with receiving malabsorptive procedures or restrictive procedures among morbidly obese patients

Variable	Anemia	Crude1			Adjusted2
	No. (n = 221)	HR	(95%CI)	P value	HR	(95%CI)	P value
Malabsorptive procedures
No	64	1	Reference		1	Reference
Yes	157	2.76	(2.06-3.70)	< 0.0001	3.18	(2.29-4.40)	< 0.0001
Restrictive procedures
No	62	1	Reference		1	Reference
Yes	159	1.38	(1.02-1.86)	0.0356	1.55	(1.10-2.19)	0.0129

¹Crude HR: Represented relative hazard ratio.

²Adjusted HR: Represented adjusted hazard ratio: Mutually adjusted for sex, age, receiving bariatric surgery or not, baseline comorbidities (as like tables) in Cox proportional hazard regression. CI: Confidence interval; HR: Hazard ratio.