condition mean min max ZT0-3 14.73138 14.73138 14.73138 ZT4-7 18.521357000000002 18.521357000000002 18.521357000000002 ZT8-11 20.342733000000003 20.342733000000003 20.342733000000003 ZT12-15 18.386633500000002 18.386633500000002 18.386633500000002 ZT16-19 18.570207500000002 18.570207500000002 18.570207500000002 ZT20-23 15.0388895 15.0388895 15.0388895