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. 1999 Oct 25;1999(4):CD002080. doi: 10.1002/14651858.CD002080

Persson 1996.

Methods Randomized, parallel, double‐blind, placebo‐ 
 controlled study.
Participants N= 54; 
 Geographic region: Sweden 
 Mean age: not reported 
 Discontinuations/Not available to follow‐up: 20 dropouts across all groups
Interventions (a) Allopurinol 300 mg + placebo (n=18) 
 (b) Allopurinol 
 300 mg two times daily (n=16) 
 (c) placebo (n=20). 
 Study duration: 240 days
Outcomes Subjective discomfort scale; urate (serum, urine, expressed prostatic secretion), xanthine, leukocyte concentrations.
Notes Randomization code was centralized but not described.
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Unclear risk B ‐ Unclear