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Table 1 Univariate analysis for factors associated with intraoperative blood loss

From: Predictive factors for intraoperative blood loss in surgery for adolescent idiopathic scoliosis

  Correlation Coefficient (95%CI) p-valuea
Age −0.02 (− 0.15–0.12) 0.82
Genderb 0.30 (0.17–0.43) < 0.01*
Body mass index 0.02 (− 0.12–0.16) 0.30
Smokingb −0.07 (− 0.21–0.06) 0.28
Preoperative hemoglobin level 0.18 (0.04–0.31) 0.01*
Preoperative Cobb angle 0.16 (0.02–0.29) 0.02*
Number of fused levels 0.46 (0.34–0.58) < 0.01*
Operation duration 0.65 (0.54–0.75) < 0.01*
Preoperative albumin level 0.12 (− 0.01–0.26) 0.07
Number of anchors 0.47 (0.35–0.59) < 0.01*
  1. CI confidence interval
  2. * Significance at p-value < 0.05
  3. a Spearman’s correlation test unless stated otherwise
  4. bPoint-serial correlation test