Charlson comorbidity index is predictive of postoperative clinical outcome after single-level posterior lumbar interbody fusion surgery

Table 2 The correlation coefficient between CCI score and each item

	Correlation coefficient with CCI
Operative time	− 0.01
Intraoperative blood loss	− 0.0007
Length of stay	0.18
Direct cost	0.16

ISSN: 1749-799X