Table 4

Scoring by type of evidence included in the reviews

Classification

Type of evidence


1

Systematic reviews of RCTs


2

Systematic reviews of individual, non-RCTs, case-control studies, cohort studies, controlled before-and-after (CBA), interrupted time series (ITS), correlation studies


1&2

Systematic reviews of both RCTs and non-RCTs, case-control studies, cohort studies, controlled before-and-after (CBA), interrupted time series (ITS), correlation studies


Jepson et al. BMC Public Health 2010 10:538   doi:10.1186/1471-2458-10-538

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