The paradoxical conclusion is that treatment A is more effective when used on small stones , and also when used on large stones , yet treatment B is more effective when considering both sizes at the same time .
The table shows the success rates and numbers of treatments for treatments involving both small and large kidney stones , where Treatment A includes all open procedures and Treatment B is percutaneous nephrolithotomy : The paradoxical conclusion is that treatment A is more effective when used on small stones , and also when used on large stones , yet treatment B is more effective when considering both sizes at the same time .