Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom improvement
RCT	33 men	Mean improvement in total National Institutes of Health-Chronic Prostatitis Symptom Index (NIH-CPSI) scores 1 month from 21 to 13 with quercetin 500 mg twice daily for 1 month from 20.2 to 18.8 with placebo	P = 0.003	Effect size not calculated	quercetin
RCT	33 men	Clinically meaningful improvement (more than 25% improvement in NIH-CPSI scores) 1 month 67% with quercetin 500 mg twice daily for 1 month 20% with placebo Absolute numbers not reported	P = 0.001	Effect size not calculated	quercetin
RCT	33 men	Urinary dysfunction 1 month with quercetin 500 mg twice daily for 1 month with placebo Absolute results not reported	Reported as not significant P value not reported		Not significant