Table 3

Bivariate analysis of perioperative variables and LOS.

VariableMean ± SDa Spearman ρ P Valueb
Length of surgery161.3 ± 90.50.32<0.0001b
Instrumented segments3.9 ± 1.50.30<0.0001b
Estimated blood loss582.8 ± 676.60.36<0.0001b
  N (%)c LOS, median ± IQR
Surgical technique0.005b
 Open133 (67.9)7.4 ± 7.1
 Minimally invasive surgery63 (32.1)5.6 ± 4.2
Surgical approach0.37
 Posterior184 (93.9)6.7 ± 6.7
 Anterior9 (4.6)6.5 ± 2.3
 Combined3 (1.5)12.6 ± 5.3
Packed red blood cells transfusion<0.0001b
 No144 (73.5)6.0 ± 4.3
 Yes52 (26.5)9.5 ± 11.2

  • ↵a Continuous variables reported as mean ± SD and Spearman ρ correlation with LOS.

  • ↵b Indicates statistically significant values with P < 0.05.

  • ↵c Categorical variables reported as N (%) and median LOS ± IQR.

  • IQR, interquartile range; LOS, length of stay.