Table 2. Comparison of VAS, ODI, ESR, CRP and operation time, blood loss, hospital stay, and hospitalization expenses pre- and postoperatively in and among three groups (X± S).
| Group A1 | Group A2 | Group B1 | PA1-A2 | PA1-B1 | PA2-B1 | |
|---|---|---|---|---|---|---|
| follow-up time | 35.8±11.5 | 36.9±6.7 | 34.8±7.0 | 0.791 | 0.700 | 0.434 |
| Preoperative VAS | 5.9±1.3 | 5.8±1.5 | 5.7±1.3 | 0.844 | 0.560 | 0.832 |
| Follow-up VAS | 1.7±1.4* | 1.8±1.3* | 1.1±0.8* | 0.915 | 0.055 | 0.163 |
| Preoperative ODI | 64.9±15.3 | 69.2±15.2 | 60.8±12.1 | 0.470 | 0.307 | 0.108 |
| Follow-up ODI | 12.8±9.1* | 13.6±7.5* | 13.9±11.4* | 0.826 | 0.728 | 0.947 |
| Preoperative ESR | 41.5±27.8 | 60.8±67.2 | 43.9±26.1 | 0.224 | 0.761 | 0.261 |
| At 3 months postoperative ESR | 13.0±10.6* | 11.1±4.1* | 13.4±9.1* | 0.620 | 0.889 | 0.489 |
| Preoperative CRP | 24.5±18.2 | 34.8±26.0 | 30.1±19.3 | 0.206 | 0.308 | 0.573 |
| At 3 months postoperative CRP | 10.3±4.4* | 8.9±5.3* | 14.3±10.4* | 0.439 | 0.100 | 0.161 |
| Operation time (min) | 240.0±52.5 | 320±77.4# | 240.8±66.2 | 0.016 | 0.961 | 0.006 |
| Blood loss (ml) | 728.0±505.0 | 944.4±600.2 | 518.8±303.2 | 0.302 | 0.085 | 0.071 |
| Hospital stay (days) | 18.7±9.6 | 20.8±6.4 | 17.9±10.1 | 0.550 | 0.776 | 0.428 |
| hospitalization expenses | 73006.0±18860.1 | 66712.2±8618.3 | 76216.5±20894.0 | 0.194 | 0.575 | 0.074 |
*, # Significant difference at P<0.05 compared with pre-operation and group A1, respectively.