Baseline variables
| Experimental | Control | |||
|---|---|---|---|---|
| TDR/RCT | TDR/non-RCT | Fusion/RCT | Fusion/non-RCT | |
| Demographic | ||||
| n | ||||
| Age | ||||
| Gender | ||||
| Smokers | ||||
| Surgical | ||||
| Prior surgery | ||||
| Levels | ||||
| Outcome variables | ||||
| Back pain VAS (0–100) | ||||
| ODI (0–100) | ||||
| EQ5D (version) | ||||
| EQVAS (version) | ||||
Abbreviations: TDR, total disc replacement; RCT, randomized controlled trial; VAS, visual analog scale; ODI, Oswestry Disability Index; EQ5D, EuroQol measure; EQVAS, EuroQol visual analog scale.