Table 1. Baseline characteristics of studies included in the meta-analysis.
| Source | Study characteristics | Number of patients | Age (Mean±SD) (years) | Sex(male/female) | Number of cervical levels | Follow up (months) | Number of trial sites | |||
|---|---|---|---|---|---|---|---|---|---|---|
| DCDA | ACDF | DCDA | ACDF | DCDA | ACDF | |||||
| Chen 2013 | November 2008 to October 2010 | 16 | 16 | 43.2±10.2 | 46.5±7.9 | 9/7 | 8/8 | Single-level | 24 | 1 |
| Luo 2015 | January 2009 to October 2011 | 34 | 37 | 47.2±6.5 | 46.3±7.1 | 18/16 | 20/17 | Single-level | 48 | 1 |
| Rozankovic 2016 | October 2008 to June 2010 | 51 | 50 | 41.32±8.8 | 41.94±9.36 | 25/26 | 25/25 | Single-level | 24 | 1 |
| Shi 2016 | September 2009 to December 2012 | 60 | 68 | 46.5±6.8 | 47.4±7.0 | 36/35 | 24/33 | Single-level | 24 | 1 |
| Skeppholm 2015 | April 2007 to May 2010 | 81 | 70 | 46.7±6.7 | 47.0±6.9 | 40/41 | 33/37 | Mixed-level | 24 | 2 |
| Sun 2016 | December 2009 to December 2011 | 14 | 16 | 46.79±5.15 | 48.13±5.98 | 9/5 | 11/6 | Two-level | 32.4 | 1 |
DCDA: Discover cervical disc arthroplasty, ACDF: anterior cervical discectomy and fusion.