I gave the link so you could read it all, for instance this bit,

"Matthias Behnk, from OHCHR, told BBC News that the organisation would not want to speculate about why there had been so many adult male casualties, adding that because they were having to deal with a lot of casualties in a short time, they had "focused primarily on recording the casualties".

"As such, we have not at this stage conducted a detailed analysis of trends of civilian casualties, for example in relation to the reasons why different groups are affected and the types of incidents, but hope to carry this out at some point in the coming future," he said.

"However, even in the compiling of these preliminary figures, we cross-verify between different sources, not only media and several different human rights organisations, but also use other sources, including, for example, names of alleged fighters released by the Israel Defense Forces (IDF) and notices by armed groups in Gaza claiming someone as a member."

A number of other news organisations have been considering the civilian-to-fighter ratio.

An analysis by the New York Times looked at the names of 1,431 casualties and found that "the population most likely to be militants, men ages 20 to 29, is also the most overrepresented in the death toll. They are 9% of Gaza's 1.7 million residents, but 34% of those killed whose ages were provided."

"At the same time, women and children under 15, the least likely to be legitimate targets, were the most underrepresented, making up 71% of the population and 33% of the known-age casualties." "