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Table 2 Quality assessment of the included cohort trials

From: Postoperative bisphosphonate do not significantly alter the fusion rate after lumbar spinal fusion: a meta-analysis

 

Study (year)

Sang-Mok Kim (2014)

Chao-Wei Tu (2014)

Qirui Ding (2017)

Selection

 Representativeness of the exposed cohort

*

*

*

 Ascertainment of exposure

*

*

*

 Outcome not present at the start of the study

*

*

*

Comparability

   

 Comorbidities

*

  

 Other factors

*

*

*

Outcome

 Assessment of the outcome

*

*

*

 Follow-up long enough for the outcome to occur

*

*

*

 Adequacy of the follow-up

*

*

*

Total

8

7

7