condition mean min max ZT0-3 15.744475 14.991299999999999 16.49765 ZT4-7 18.908549999999998 18.908549999999998 18.908549999999998 ZT8-11 13.94005 13.94005 13.94005 ZT12-15 0 0 0 ZT16-19 20.40925 20.40925 20.40925 ZT20-23 22.047 22.047 22.047