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Table 1 Evidence level of systematic reviews

From: Public health interventions in midwifery: a systematic review of systematic reviews

Score Source of evidence
1++ High quality meta analyses or systematic reviews of RCT’s
1+ Well conducted meta analyses or systematic reviews of RCT’s
1- Meta analyses or systematic reviews of RCT’s
2++ High quality systematic reviews of case control or cohort studies
2+ Well conducted case control or cohort studies with low risk of bias
2- Case control or cohort studies with high risk of bias
3 Case reports or case series
4 Expert opinion or formal consensus
  1. From Scottish Intercollegiate Guidelines Network [13].