Our results showed an apparent trend, although not statistically significant ( p = 0.198), in favor of the tamsulosin group in the stone-free rate for larger stones (11–20 mm in diameter), and these results are consistent with the findings of the last two cited placebo-controlled studies.
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Efficacy of Adjuvant Tamsulosin for Improving the Stone-Free Rate after Extracorporeal Shock Wave Lithotripsy in Renal Stones: A Randomized Controlled Trial.
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The sentences
Similar to our study, these differences did not reach statistical significance; the higher values of free stone rates could be explained by the multiple ESWL sessions (average 2.07 sessions per patient).