Phosphodiesterase-5 inhibitors for erectile dysfunction in patients with diabetes mellitus: A systematic review and meta-analysis of randomized controlled trials.

Indian J Endocrinol Metab · 2015 · PMC4481650 · PMID 26180759

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may not be significantno p-value reported

This suggests that on the head to head comparisons, there may not be significant differences between PDE5 inhibitors, though studies to that effect are very sparse.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.