Table 4 Interspinous level of successful puncture and block level
|  | Landmark- guided group n = 40 | Ultrasound- assisted group n = 40 | P value |
|---|---|---|---|
Interspace level of successful puncture n (%) | 0.036 | ||
 L2/L3 | 10 (25%) | 19 (47.5%) |  |
 L3/L4 | 30 (75%) | 21 (52.5%) |  |
Peak dermatome level n (%) | 0.251 | ||
 T8 | 13 (32.5%) | 18 (45%) |  |
 T10 | 27 (67.5%) | 22 (55%) |  |