Table 1.
Baseline characteristics of the study participants.
| Total | 995 |
|---|---|
| Mean age | 53.69 years; range 17.5–93.3 |
| Gender | Male 587 (59%) |
| Female 448 (41%) | |
| ASA 1(no disturbance) | 326 (32.8%) |
| ASA 2 (mild/moderate) | 333(33.5%) |
| ASA 3(severe) | 283(28.5) |
| ASA 4 (life threatening) | 46((4.6%) |
| ASA 5 (moribund) | 1 (0.1%) |
| Mean preoperative LBP VAS | 6.10; SD 2.94 |
| Mean preoperative LP VAS | 7.58; SD 2.33 |
| Mean LP – LBP VAS | 1.48; SD 2.97 |
| Mean preoperative COMI score | 7.85; SD 1.68 |
| Main problem | |
| Back pain | 170 (17.09%) |
| Leg pain | 526(52.86%) |
| Sensory disturbance | 289 (28.65%) |
| Other | 10 (1.01%) |
| Smoker | 76 (7.64%) |
| Non-smoker | 385(38.69) |
| Unknown | 574(57.69%) |
| Level of intervention | |
| L1-L2 | 19 (1.91%) |
| L2-L3 | 69 (6.94%) |
| L3-L4 | 336 (33.77%) |
| L4-L5 | 441 (44.32%) |
| L5-S1 | 130 (13.07%) |