Oh 2009

Methods	Study design: parallel group randomised trial. Study dates: not available. Setting: not available. Country: South Korea.
Participants	Inclusion criteria: not available. Exclusion criteria: not available. Sample size: 30. Age: not available. Sex: men.
Interventions	Group 1 (n = not available): radiofrequency. Group 2 (n = not available): 'placebo therapy.' Cointerventions: not available.
Outcomes	Prostatitis symptoms How measured: NIH‐CPSI and Pelvic Pain Symptoms Survey. Time points measured: baseline, and 1 month after treatment. Time points reported: only P value of 1 month after treatment.
Funding sources	None.
Declarations of interest	Not available.
Notes	We extracted this information from an abstract presentation. We contacted the authors: Dr Oh (mamah@hanmail.net) and Dr Bae (urobae@genetherapy.or.kr) and they mentioned that there was no publication available.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Abstract only.
Allocation concealment (selection bias)	Unclear risk	Abstract only.
Blinding of participants and personnel (performance bias) Subjective outcomes	Unclear risk	Abstract only.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Abstract only.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Abstract only.
Selective reporting (reporting bias)	Unclear risk	Abstract only.
Other bias	Unclear risk	Abstract only.