Classic system*	NIH proposal†
Acute prostatitis	I Acute prostatitis
Chronic bacterial prostatitis	II Chronic bacterial prostatitis
Chronic nonbacterial prostatitis	IIIa Chronic nonbacterial prostatitis/chronic pelvic pain syndrome–inflammatory
Prostadynia	IIIb Chronic nonbacterial prostatitis/chronic pelvic pain syndrome–noninflammatory
—	IV Asymptomatic prostatitis