Table 2.
Outcome variables at baseline, 3 months and 12 months after surgery
| Outcome variable | Baseline Mean (95% CI)§ |
3 months Mean (95% CI)§ |
12 months Mean (95% CI)§ |
P value* |
|---|---|---|---|---|
| EQ-5D‡, total score | 0.32 (0.26 - 0.38) | 0.63 (0.57 - 0.68) | 0.60 (0.53 - 0.66) | < 0.001 |
| EQ-VAS†, current health | 48.0 (44.1 - 51.9) | 62.0 (58.5 - 65.6) | 60.4 (55.6 - 65.2) | < 0.001 |
| Oswestry Disability Index | 44.2 (40.6 - 47.9) | 25.6 (21.9 - 29.3) | 27.9 (23.4 - 32.5) | < 0.001 |
| VAS, back pain | 55.7 (50.5 - 60.9) | 30.0 (25.0 - 35.0) | 35.9 (29.3 - 42.4) | < 0.001 |
| VAS, leg pain | 60.2 (55.2 - 65.2) | 26.4 (20.7 - 32.0) | 33.6 (27-0 - 40.1) | < 0.001 |
*P values for all outcome variables at both time intervals were P < 0.001. §CI; confidence interval. †VAS; visual analogue scale. ‡EQ-5D; EuroQol-5 D, instrument for assessing health related quality of life