Hidden blood loss in adolescent idiopathic scoliosis patients undergoing posterior spinal fusion surgery: a retrospective study of 765 cases at a single centre

Table 5 Results of binary logistic regression analysis for postoperative transfusion in scoliosis corrective surgery patients

Variables	β	SE	P	OR	95 %CI
Gender	1.347	0.319	0.021	3.845	2.056–7.192
Segment number> 11	0.569	0.221	0.010	1.766	1.145–2.724
BMI > 16.7 kg/m2	−0.241	0.215	0.262	0.786	0.516–1.198
Preoperative Hb> 128 g/L	−1.065	0.213	< 0.001	0.345	0.227–0.523
Pedicle screw number> 14	−0.189	0.243	0.436	0.828	0.514–1.333
Postoperative drainage> 425 ml	0.978	0.211	< 0.001	2.658	1.759–4.017
HBL > 850 ml	2.180	0.208	< 0.001	8.845	5.806–13.290

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