condition mean min max ZT0-3 24.908195 9.201834999999999 46.675200000000004 ZT4-7 25.4669 25.4669 25.4669 ZT8-11 18.1784 18.1784 18.1784 ZT12-15 51.600425 46.00075 57.2001 ZT16-19 19.7558 19.7558 19.7558 ZT20-23 11.4346 11.4346 11.4346