condition mean min max ZT0-3 3.4540824999999997 2.7343599999999997 4.173805 ZT4-7 2.79942 2.79942 2.79942 ZT8-11 1.567335 1.567335 1.567335 ZT12-15 0 0 0 ZT16-19 2.5223199999999997 2.5223199999999997 2.5223199999999997 ZT20-23 4.68863 4.68863 4.68863