condition mean min max ZT0-3 0.9478803333333334 0.9478803333333334 0.9478803333333334 ZT4-7 1.1244725 1.1244725 1.1244725 ZT8-11 1.1792099999999999 1.1792099999999999 1.1792099999999999 ZT12-15 0.9582905 0.9582905 0.9582905 ZT16-19 0.978913 0.978913 0.978913 ZT20-23 0.533179 0.533179 0.533179