condition mean min max ZT0-3 1.1131345 0.838879 1.38739 ZT4-7 4.005935 4.005935 4.005935 ZT8-11 2.34864 2.34864 2.34864 ZT12-15 0 0 0 ZT16-19 0.663825 0.663825 0.663825 ZT20-23 0.7621785000000001 0.7621785000000001 0.7621785000000001