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Table 2 Risk of bias assessment of the observational studies

From: Prognostic value of gasping for short and long outcomes during out-of-hospital cardiac arrest: an updated systematic review and meta-analysis

Study Selection Comparability Outcome Total Score
Exposed Cohort Nonexposed Cohort Ascertainment of Exposure Outcome of Interest   Assessment of Outcome Length of Follow-up Adequacy of Follow-up
Martens .. * * * * * * * * 8
Debaty * * * * * * * * * 9
Wolfskeil * * * * * * * * 8
Knor * * * * * * * * .. 9
Fukushima * * .. * * * * * * 8
  1. Risk of bias was assessed using the Newcastle-Ottawa Scale. A higher overall score corresponds to a lower risk of bias; a score of ≤5 (out of 9) indicates a high risk of bias