2 of 4 Extracted claim. Defined terms. Removed extraneous claims about Israel.

Is the the “civilian casualty ratio” in modern day warfare about 3-4:1?

The Israel Defense Forces (IDF) claim that, in modern warfare, about 3 civilians are killed for every militant killed.

This concept can be scientifically proven by understand (sic) the basic concept of “civilian casualty ratio”, that is in every conflict you need to look at the number of civilian causalities versus the number of combatant causalities. This ratio obviously differs from conflict to conflict, but the average in modern day warfare is between 3-4:1. Estimated ratios in NATO operations in Afghanistan were 3:1, western campaigns in Iraq and Kosovo were believed to be 4:1, and the conflicts in Chechnya and Serbia were much higher than 4:1. That is to say that for each combatant that is killed 3-4 or more civilians are killed.

They then compare this statistic favorably to Operation Cast Lead and Operation Pillar of Defense, in which the civilian casualty ratio was about 1:1 (i.e. much more focussed on avoiding civilian deaths).

Many would reasonably object to the use of an IDF source to defend the IDF. Also, I had a bit of trouble finding the specific UN statement to which they referred.

Can anybody here please determine whether the IDF's statement is accurate?