condition mean min max ZT0-3 1.110686 1.1087145 1.1126575 ZT4-7 3.36162 3.36162 3.36162 ZT8-11 12.179739999999999 12.179739999999999 12.179739999999999 ZT12-15 0 0 0 ZT16-19 2.697975 2.697975 2.697975 ZT20-23 3.34701 3.34701 3.34701