Data Extraction and Quality assessment
Articles retrieved from the systematic search were exported to EndNote
Reference Library software, and any duplicates found were discarded. The
remaining articles were initially screened based on abstract and title,
then a review of the entire text was conducted to assess relevance.
Screening of the articles was distributed amongst two reviewers, (M.H,
H.M), and any inconsistencies were resolved by discussion till consensus
or by the third reviewer (A.R.S.S). The following baseline
characteristics were extracted onto an online Microsoft Excel
Spreadsheet: study characteristics (First author’s name along with
publication year, study design, number of patients) population
characteristics (patient age in years, male gender percentage, Body mass
index (BMI)(kg/m2), ASA score, mean operation time, subgroups of dosage
of drug). The baseline characteristics are given in