condition mean min max ZT0-3 1.5520875 1.47926 1.624915 ZT4-7 2.097505 2.097505 2.097505 ZT8-11 6.465675 6.465675 6.465675 ZT12-15 0 0 0 ZT16-19 6.74381 6.74381 6.74381 ZT20-23 3.5562500000000004 3.5562500000000004 3.5562500000000004