condition mean min max ZT0-3 1.35 1.35 1.35 ZT4-7 0.6 0.6 0.6 ZT8-11 3.6999999999999997 3.6999999999999997 3.6999999999999997 ZT12-15 0.75 0.75 0.75 ZT16-19 0.44999999999999996 0.44999999999999996 0.44999999999999996 ZT20-23 0.6499999999999999 0.6499999999999999 0.6499999999999999