Data extraction
The following items were subtracted from the eligible publications by
using the standard spreadsheets presented in published RCTs: study
characteristics (first author, publishing year and study design),
participant characteristics (sample size, age, note about subject,
gender, health status) and intervention (type of intervention (study
group), duration and dosage). The outcome measures included mean and
standard deviation (SD) and changes in serum uric acid at baseline, and
the end of the study. If additional details were needed, we contacted
study authors. Values reported on mg/dl for serum uric acid were
converted to μmol/l by multiplying to 59.48.