Table 1: Clinical and demographic characteristics ( ).

CharacteristicValue

Gender
Male37 (51.4%)
Female35 (48.6%)
Age (years) mean61.4 ± 11.3 (31–82)
Follow-up (months) mean46.7 ± 7.8 (33–58)
Number of instrumented levels
1-level31 (43.1%)
2-levels41 56.9%)