condition mean min max ZT0-3 4.1900224999999995 3.0065 5.373545 ZT4-7 2.60022 2.60022 2.60022 ZT8-11 2.9744349999999997 2.9744349999999997 2.9744349999999997 ZT12-15 0 0 0 ZT16-19 4.234285 4.234285 4.234285 ZT20-23 4.91796 4.91796 4.91796