Table 1.

Patients’ demographics and preoperative parameters

Sample characteristics	Mean
Gender ratio female:male	15:8
ASA score	2.3
Age at index surgery	66 years
Age at follow-up	68 years
Follow-up	14.2 months
Failed previous surgery	43.5%
Global sagittal imbalance	78.3%
Scoliosis	43.5%