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Table 1 Characteristics of the studies included in this meta-analysis

From: Zero-profile implant versus conventional cage-plate implant in anterior cervical discectomy and fusion for the treatment of degenerative cervical spondylosis: a meta-analysis

Study Design Sample size (male/female) Surgical level Mean age (years) Outcome Follow-up time (m) Zero-profile implant
Zero-p CCP Zero-p CCP Zero-p CCP  
Wang ZW et al. (2015) [11] Retrospective cohort 30 (18/12) 33 (14/19) 1 to 2 56.8 54 Operation time, blood loss, NDI and JOA scores, Cobb angles, fusion rate, postoperative dysphagia, adjacent disc degeneration and instability, cervical lordosis Mean 24.1, minimum 12 Mean 23.8, minimum 12 ROI-C, LDR, Troyes, France
Son DK et al. (2014) [13] Retrospective 21 27 1 55.4 50.2 Operation time, blood loss, mJOA and achieved mJOA scores, mJOA recovery rate, prevertebral soft tissue thickness, postoperative dysphagia, adjacent disc degeneration 6 6 Zero-p; Synthes GmbH, Oberdorf, Switzerland
Wang ZD et al. (2014) [16] Retrospective 22 (11/11) 25 (10/15) 1 50.9 53.7 Operation time, blood loss, JOA scores, JOA recovery rate, postoperative dysphagia, adjacent segment degeneration Mean 33.6 Mean 33.2 Zero-p; Synthes GmbH, Oberdorf, Switzerland
Li YB et al. (2013) [12] Prospective, RCT 23 (9/14) 23 (13/10) 1 49.3 50.1 Operation time, blood loss, exposure time to X-rays, JOA and VAS scores, postoperative dysphagia, fusion time, adjacent disc degeneration 24 24 Zero-p; Synthes GmbH, Oberdorf, Switzerland
Qi M et al. (2013) [14] Retrospective cohort 83 (47/36) 107 (58/49) 1 to 3 43.6 44.9 Operation time, blood loss, NDI and VAS scores, fusion rate, graft migration or nonunion, Cobb angles, modified Swallowing Quality of Life scores Mean 18.6 Mean 19.3 Zero-p; Synthes GmbH, Oberdorf, Switzerland
Vanek P et al. (2013) [15] Prospective 44 (26/18) 33 (19/14) 1 to 2 50.2 51.8 NDI scores, Cobb C and Cobb S angles, 2-year radiological stability, dysphagia Minimum 24 Minimum 24 Zero-p; Synthes GmbH, Oberdorf, Switzerland
Miao JH et al. (2013) [17] Prospective 39 (23/16) 50 (29/21) 1 to 3 50.3 52.6 JOA and VAS scores, postoperative dysphagia, Cobb angles, 1-year operation effect, implant displacement, and vertebral instability Mean 16.9 Zero-p; Synthes GmbH, Oberdorf, Switzerland
  1. NDI neck disability index, JOA Japanese Orthopaedic Association, VAS visual analog scale