Table 1.

Demographic characteristics, ASA status, duration of surgery, dose of anesthetics and DSCSA (Mean ± SD)

	Group C (n = 30)	Group U (n = 30)	P-value
Age (years)	78.3 ± 5.8	77.4 ± 5.5	0.555
Height (cm)	169.0 ± 6.9	169.6 ± 7.2	0.771
Weight (kg)	65.9 ± 8.9	66.0 ± 8.6	0.977
ASA(I / II / III)	16/10/ 4	18 /9/ 3	0.855
Duration of surgery (min)	92.4 ± 17.8	86.2 ± 19.3	0.354
DSCSA( mm2)	106.8 ± 8.2	102.5 ± 7.6	0.924
Dose of bupivacaine (mg)	10.0 ± 0.0	6.7 ± 1.6	< 0.001

ASA American Society of Anesthesiologists, DSCSA dural sac cross-sectional area