Table 1.

PDE-5 inhibitor trials by condition (percent of total)

Condition	Sildenafil	Tadalafil	Vardenafil
Mixed aetiology	67	75	73
Diabetes	14	11	13
Prostatectomy	0.0	15	13
Depression	5.7	0.0	0.0
Spinal cord injury	5.3	0.0	0.0
Multiple sclerosis	3.1	0.0	0.0
Coronary heart disease	2.1	0.0	0.0
Radiotherapy for prostate cancer	1.7	0.0	0.0
Renal failure and haemodialysis	1.0	0.0	0.0
Rectal surgery	0.5	0.0	0.0
Spina bifida	0.5	0.0	0.0