Table 3.

Results of logistic regression analysis showing variables affecting the risk of needing blood transfusion among patients undergoing arthroplasty surgery (N = 188).

Variable	B	Wald	P-value	OR	CI
Age	0.01	0.13	0.71	1.01	0.96–1.05
Admission duration	0.18	2.82	0.28	1.20	0.96–1.49
Hb loss at 6 h after surgery	−0.18	0.52	0.19	0.83	0.50–1.37
Hb loss at 24 h after surgery	0.53	1.1	0.28	1.8*	1.24–2.32
Preoperative Hb	−1.1	18.3	0.000	0.3	0.19–0.46
Body mass index	−0.05	1.06	0.30	0.95	0.85–1.05
Obesity	0.26	0.22	0.63	1.30	0.45–3.73
Site of surgery	−0.32	0.96	0.33	0.72	0.38–1.38
Type of anesthesia	0.47	0.83	0.36	1.60	0.58–4.20
Using tourniquet	−0.27	0.64	0.42	0.76	0.39–1.47
Volume of blood loss	000	0.002	0.001	0.67	0.99–1.00
Diagnosis	−0.30	0.30	0.58	0.74	0.25–2.15
Comorbid diseases	0.35	1.00	0.31	1.42	0.71–2.82

OR, odds ratio; CI, confidence interval; Hb, hemoglobin.

Findings were considered significant at p < 0.05.