6. Data Synthesis. State the main results of
the review, whether qualitative or quantitative, and outline the methods used
to obtain these results. Meta-analyses should state the major outcomes that
were pooled and include odds ratios or effect sizes and, if possible, sensitivity
analyses. Numerical results should be accompanied by confidence intervals,
if applicable, and exact levels of statistical significance. Evaluations of
screening and diagnostic tests should include sensitivity, specificity, likelihood
ratios, receiver operating characteristic curves, and predictive values. Assessments
of prognosis should summarize survival characteristics and related variables.
Major identified sources of variation between studies should be stated, including
differences in treatment protocols, co-interventions, confounders, outcome
measures, length of follow-up, and dropout rates.