condition mean min max ZT0-3 2.0525124999999997 1.356335 2.74869 ZT4-7 2.79821 2.79821 2.79821 ZT8-11 1.35849 1.35849 1.35849 ZT12-15 0 0 0 ZT16-19 4.0484 4.0484 4.0484 ZT20-23 3.392275 3.392275 3.392275