condition mean min max ZT0-3 21.648049999999998 21.3889 21.9072 ZT4-7 14.798649999999999 14.798649999999999 14.798649999999999 ZT8-11 10.45325 10.45325 10.45325 ZT12-15 0 0 0 ZT16-19 15.198550000000001 15.198550000000001 15.198550000000001 ZT20-23 15.1024 15.1024 15.1024