condition mean min max ZT0-3 14.512457934999999 13.04420789 15.980707979999998 ZT4-7 18.737645435 17.683091855 19.792199015 ZT8-11 15.382969965 14.453179145 16.312760785 ZT12-15 12.1474193475 11.01595202 13.278886674999999 ZT16-19 18.7786526425 15.678810895000002 21.87849439 ZT20-23 26.51788869 25.525602985 27.510174395