Table 4 Comparison of clinical effects
|  | PLIF (n = 74) | M-TLIF (n = 74) | P |
|---|---|---|---|
VAS of Low back, mean (SD) | |||
 Preoperative | 5.82 (1.01) | 5.58 (0.92) | 0.128 |
 Seven days after operation | 3.22 (0.88)** | 2.80 (0.60)** | 0.001 |
 Three months after operation | 2.35 (0.65)** | 2.08 (0.36)** | 0.002 |
 Last follow-up | 1.73 (0.50)** | 1.43 (0.50)** |  < 0.001 |
VAS of Leg, mean (SD) | |||
 Preoperative | 5.74 (0.88) | 5.49 (0.74) | 0.120 |
 Seven days after operation | 3.19 (0.96)** | 2.69 (0.54)** | 0.001 |
 Three months after operation | 2.38 (0.77)** | 2.00 (0.43)** | 0.002 |
 Last follow-up | 1.40 (0.53)** | 1.31 (0.84)** | 0.521 |
ODI, mean (SD) | |||
 Preoperative | 40.50 (3.12) | 40.64 (3.10) | 0.792 |
 Seven days after operation | 26.27 (4.11)** | 23.95 (5.05)** | 0.003 |
 Three months after operation | 17.85 (3.35)** | 15.41 (4.40)** |  < 0.001 |
 Last follow-up | 11.36 (2.40)** | 11.08 (2.77)** | 0.506 |