Tuhkanen 1999b.

Methods	CONTACT LASER. Tissue effect: coagulation and vaporization. Subjects blinded: Unclear
Participants	N=50 Country/Region: Finland Mean age: 67 (range 56‐77) Race: unknown Not available to follow‐up: 2 (4%)
Interventions	1. Laser group (contact and vaporization) (n=25 ) Nd‐YAG laser settings; 40 watts. 2. TURP (n=25): Catheter protocol: no Routine antibiotics (preop): yes Mean average of follow‐up: 6 months
Outcomes	Danish PSS‐1; PUF; RV; Prostate size; Hospital length of stay; Rehospitalization/re‐operation; Adverse events.
Notes	Inclusion criteria: Prostate volume 40‐100 cc. Urodynamic evidence of obstruction; voiding detrusor pressure >40 cm H2O or slope detrusor pressure/urine flow >2 cm H20 mL/s.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear