condition mean min max ZT0-3 0.8595316666666667 0.6955754999999999 1.17232 ZT4-7 0.681686 0.681686 0.681686 ZT8-11 2.246075 2.246075 2.246075 ZT12-15 5.4848175 5.416475 5.55316 ZT16-19 3.0262849999999997 3.0262849999999997 3.0262849999999997 ZT20-23 1.409525 1.409525 1.409525