NR, not reported. aIndicates exposed cohort truly representative. bNon-exposed cohort drawn from the same community. cAscertainment of exposure from a secure record. dOutcome of interest not present a
For each domain, either a "star" or "no star" is assigned, with a "star" indicating that study design element was considered adequate and less likely to introduce bias. A maximum of two stars can be g
P-values are based on a chi-squared test for differences between the distribution of those who did and did not provide a blood sample. Only those who provided a sample are included in the present anal
This is the data and code used in the publication "High quality of evidence is uncommon in Cochrane systematic reviews in Anaesthesia, Critical Care and Emergency Medicine" published in the European J
