Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2019 Jun 25;18(2):1366–1374. doi: 10.3892/etm.2019.7710

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright: © Zhu et al.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

PMC Copyright notice

Figure 7. — Comparison of percutaneous nephrolithotripsy or retrograde intrarenal surgery on operation time in the subgroup analysis according to study design. WMD, weighted mean difference; CI, confidence interval.