2.3 Data extraction
Data extraction and validity assessment by two researchers (FNand XC)
independently screened and extracted data according to a predetermined
proforma in Microsoft Excel Version 16, including: The data were
extracted irrespective of the type of vaccine or number of vaccine
doses. Data extraction and validity assessment by two researchers (FN
and XC) independently screened and extracted data according to a
predetermined proforma in Microsoft Excel Version 16,including: 1)
bibliometric information: title, first author, date of publication, and
the country conducting the studies; 2)details of intervention: type of
the vaccine, number of participants receiving each dose of vaccine;3)
demographic information: age, sex, and disease;4) general methodological
details: length of follow up;5) outcome information: outcomes of safety
and details of adverse events. Any Disagreements during the process were
resolved by the third researcher (ZR).