condition mean min max ZT0-3 5.932733333333334 4.417125 7.057975000000001 ZT4-7 3.417085 3.417085 3.417085 ZT8-11 2.0770299999999997 2.0770299999999997 2.0770299999999997 ZT12-15 2.9720199999999997 2.92592 3.0181199999999997 ZT16-19 2.100225 2.100225 2.100225 ZT20-23 3.865505 3.865505 3.865505