Table 1.

Patient demographics and characteristics.

Variable	Data
Group 1 (T2–L2)
No.	121 levels
Median age (range)	64 (60–85)
Mean (±SD) BMI	28.4 (±5.3).
No. lumbar levels	34
No. thoracic levels	87
Group 2 (L3–L5)
No.	36 levels
Median age (range)	61 (60–84)
Mean (±SD) BMI	27.4 (±7.5).
Overall
No.	98 patients, 157 levels
Median age (range)	69 (60–85)
Mean (±SD) BMI	28.2 (±8.3)
No. lumbar levels	70
No. thoracic levels	87

Abbreviations: BMI, body mass index; SD, standard deviation.