condition mean min max ZT0-3 1.6181025 1.5196200000000002 1.716585 ZT4-7 1.8930799999999999 1.8930799999999999 1.8930799999999999 ZT8-11 3.831035 3.831035 3.831035 ZT12-15 0 0 0 ZT16-19 3.11548 3.11548 3.11548 ZT20-23 2.697965 2.697965 2.697965