Table 2

Recommended elements in the summary tables or plots

DescriptionName of the factor (eg, ‘parental communication deviance’), optionally with a very few details such as a brief literally description of the factor, the number of studies, the number patients and controls, the time of follow-up, whether the studies are prospective, etc.
Effect sizeThe measure of effect size (eg, ‘Hedge’s g’), the outcome and its CI (eg, '1.35 (95% CI 0.97 to 1.73)') and the equivalent OR (eg, ‘11.55’).
Features used for classification of evidenceThese statistics may vary depending on the criteria used, and could be: the p value, the fraction of variance that is due to heterogeneity (I 2), the prediction interval, the CI of the largest study, the results of an Egger test (or another method to assess potential small study reporting bias) and the results of an excess significance test. To simplify the table, the authors of the umbrella review may choose to report only the bits that are most important, eg, the results of an Egger test could be simply ‘yes’ or ‘no’.
Evidence classBased on the features above.
Other statisticsSome statistics not used for the classification of evidence but that are of great interest, although we suggest that the amount of information presented is limited to ensure that the table is simple enough.