condition mean min max ZT0-3 0.65 0.65 0.65 ZT4-7 0.8 0.8 0.8 ZT8-11 1.5499999999999998 1.5499999999999998 1.5499999999999998 ZT12-15 0.55 0.55 0.55 ZT16-19 30.15 30.15 30.15 ZT20-23 1.35 1.35 1.35