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Table 2 Status of the evidence levels of domestic and international studies

From: Clinical reliability of zirconium abutment in implant restorations in the English and Korean literature

Grade Study type Result (literature)
Domestic International
1 Systematic literature review targeting RCTs (systematic review with/without meta-analysis) 0 0
2 RCT 0 0
Systematic literature review targeting category 3 0 5
3 Quasi-RCT 0 0
Cohort study 3 4
Case-control study 0 3
Observational, analytic study 0 0
4 Cross-sectional study 0 0
Case series 0 1
Case report 6 6
Non-analytic study 0 0