Given the task definition and input, reply with output. Given a passage, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.

To identify subgroups of patients with renal stones 20 mm that are more suitable for extracorporeal shock wave lithotripsy (ESWL) monotherapy.', 'A total of 376 patients with renal stones 20 mm underwent monotherapy with ESWL. The treatment outcome was evaluated after 3 months of follow-up. A stone-free status or fragmentation of stones to 4 mm or smaller was considered efficacious.', 'At 3 months after treatment, the overall stone-free rate was 64.4%, and the efficacy rate was 70.7%. The efficacy rate was 89.4% for patients with a residual stone surface area 50% of baseline after the first ESWL, while the efficacy rate was 32.4% for other patients. The efficacy was 92.2% for stones 400 mm2 and those with lower radiodensity, as determined by a plain (KUB) film.
Do treatment of Renal Stones 20 mm with Extracorporeal Shock Wave Lithotripsy?