Table 2. Characteristics of patients with tandem cervical and lumbar, and with isolated lumbar disc herniations.

LDH: lumbar disc herniation; BMI: body mass index; ASA: American Society of Anesthesiologists

	Type of Disc Herniation
Characteristic	Tandem (n = 16)	Isolated (n = 1241)	P
Male Gender	6 (38%)	661 (53%)	0.317
Active Smoker	4 (25%)	363 (29%)	0.864
Age [yrs.]	46.1 ± 7.7	44.8 ± 11.8	0.616
BMI [kg/m2]	25.3 ± 3.4	25.4 ± 3.5	0.329
ASA Class I	14 (88%)	881 (71%)	0.242
Location of Disc Herniation
Right-sided	4 (25%)	566 (45%)	0.170
Median	1 (6%)	58 (5%)	0.999
Far-Lateral	1 (6%)	53 (4%)	0.999