Reporting
We evaluated 31 relevant items
pertaining to the REporting of studies Conducted Observational
Routinely-collected health Data (RECORD) checklist[17] as a method of evaluating the completeness of
study reporting (see Supplementary Appendix B). We calculated the
completeness score, based on RECORD checklist, as the percentage of
items meeting the specified criteria in relation to the overall
applicable items for each study, with scores closer to 100% indicating
a more comprehensive reporting. Two reviewers (JOC, CB) independently
scored a sample of 20% of studies and disagreements were resolved by
discussion. Since we obtained a substantial Kappa agreement (k= 0.87),[18, 19] one reviewer (JOC) scored the remainder.