condition mean min max ZT0-3 0.48346574999999997 0.4103715 0.5565599999999999 ZT4-7 0.59066 0.59066 0.59066 ZT8-11 1.2884799999999998 1.2884799999999998 1.2884799999999998 ZT12-15 0 0 0 ZT16-19 1.161497 1.161497 1.161497 ZT20-23 0.6840655 0.6840655 0.6840655