Table 1. Patient demographics.

Demographics of the study population. One patient underwent a staged procedure; therefore, the 37 surgeries correspond to 36 patients.

# Levels	# Surgeries	# Male	BMI	Age
1	5	3	26±7	68±13
2	13	10	30±5	72±11
3	12	10	29±9	66±12
4	4	3	30±13	72±7
5	1	1	34±0	72±0
6	2	2	27±5	73±19