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Table 1 Quality assessment of studies according to the Newcastle-Ottawa Scale

From: Coronary collaterals and risk for restenosis after percutaneous coronary interventions: a meta-analysis

Lead author Representativeness Control group Ascertainment Endpoint not present at start Assessment of outcome Follow-up duration Adequacy follow-up
Probst * *   *   * *
Nakae * *   *   * *
Wahl * * * * * *  
Perera * * * * * * *
Jensen * * * * * * *
Lee * * * * * * *
Antoniucci * *   *   * *