condition mean min max ZT0-3 3.1873825 3.10102 3.273745 ZT4-7 2.2213450000000003 2.2213450000000003 2.2213450000000003 ZT8-11 1.55738 1.55738 1.55738 ZT12-15 0 0 0 ZT16-19 2.842035 2.842035 2.842035 ZT20-23 4.4855599999999995 4.4855599999999995 4.4855599999999995