Quality assessment and data extraction
Two authors (Jixiang Deng and Yuting Chen) independently screened the
manuscripts and extracted data. The Newcastle-Ottawa quality assessment
scale (NOS) was performed to assess the methodological quality. The
relevant data were extracted from the included studies: first author’s
name, publication year, study type, study population, sample size,
gender, age, body mass index (BMI) and detection methods of resistin
levels. Additional, we e-mailed the corresponding author to obtain
available information.