I'm deciding on which mobile phone to buy, and since we don't really know if electromagnetic radiation does or does not have adverse health effects (I'm considering cancer and fertility), I'd rather play it safe and take the SAR (https://en.wikipedia.org/wiki/Specific_absorption_rate) into account.
Now I see a lot of phones, that have a low head-SAR and a much higher body-SAR and I wonder why that is, e.g. the Samsung Galaxy A9 (Head SAR : 0.351 W/Kg, Body SAR : 1.587 W/Kg, https://www.samsung.com/sar/sarMain?site_cd=uk&prd_mdl_name=SM-A920F)
AFAIK both measurements are done with the phone emitting on full power, the head SAR with the phone held directly to the head and measurements done directly inside the artificial head. I could not find good information on how the body measurement is done. Is the phone pressed against the waist? How can the value be so much higher? Of course, the body is bigger than the head, but the waves reaching farther away body tissue need to travel a longer distance and thus should lose intensity.