"It is often argued that UTIs (Urinary Tract Infections) happen 10% more in uncircumcised boys. What does 10% more mean?
1 in 10 is 10% more than 1 in 100 on the other hand 1 in 6.000 is 10% more than 1 in 60,000. - What does "10% more" actually mean in terms of how often problems of this sort are occurring?"
Your maths is wrong. 1 in 10 is the same as saying 10 in 100, which is really 900% more than 1 in 100. 10% more than 1 in 100 is 1.1 in 100, or 11 in 1,000. The point your making is still right but you're using the wrong figures to make it.