Predisposing factors for allogeneic blood transfusion in patients with ankylosing spondylitis undergoing primary unilateral total hip arthroplasty: a retrospective study

Table 3 Multivariate logistic regression analysis for transfusion in THA

	OR	95% CI	Change	P value
Operative duration	1.139	1.002–1.294	Δ10 min	0.047
Estimated intraoperative blood loss	1.348	1.188–1.530	Δ100 mL	< 0.001
Postoperative drainage volume	1.235	1.028–1.483	Δ100 mL	0.024
Body mass index	0.914	0.852–0.981	Δ1 kg/m²	0.012
Perioperative TXA use	0.166	0.085–0.326		< 0.001
Preoperative hemoglobin level	0.744	0.607–0.912	Δ1 g/dL	0.004

CI confidence interval, OR odds ratio, THA total hip arthroplasty, TXA tranexamic acid

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