It incorporates several data sources, and enables researchers to maximize comparability by choosing data based on the criteria of comparability, but potentially leads to a risk of not piecing together the information in a meaningful way [ 13, 14].
We excluded 13 datasets contributing 185 TNBC cases from the discovery cohort because they did not fulfill our criteria of comparability of the microarray data (for details see Additional file 4, Supplementary Methods Section 1 and Additional file 1, Supplementary Figure S2).
Study quality was judged on the selection criteria of participants, comparability of cases and controls, and exposure or outcome assessment.
Unfortunately, the Cochrane review by Walker [ 124] assessing the impact of antibiotic treatment of syphilis in pregnancy did not report perinatal mortality outcomes, as none of the studies identified (N = 29) met the review's eligibility criteria for comparability.
The current CT-based International Workshop Criteria (IWC) still have the main advantage of representing standardized criteria allowing comparability of clinical trials in patients with lymphoma.
Based on the NOS, case control studies were judged based on three broad perspectives: selection of study groups (1 criterion), comparability of study groups (4 criteria), and ascertainment of outcome of interest (3 criteria).
It could be argued that the choice of matching criteria limited the comparability of study participants, as additional or alternative criteria could have been used.
Uniformly accepted criteria to assess the clinical relevance of comparability of monitoring techniques and parameters are lacking.
For quasi-RCTs and CBA studies, we used two additional criteria: Comparability of baseline characteristics: we classified studies as 'low risk' if there were no substantial differences between groups with respect to water quality, diarrhoeal morbidity, age, socioeconomic status, access to water, hygiene practices, and sanitation facilities.
Respondents were asked to rate each QI adopting the RAND Appropriateness Methodology (scales 1 9, 1=extremely inappropriate; 9=extremely appropriate), according to the selection criteria of relevance, scientific soundness (validity, reliability, comparability) and feasibility (precise definition and specification, data feasibility, reliability of data collection).
The scale uses a star system to evaluate observational studies on three criteria: participant selection, comparability of study groups, and assessment of exposure.
