condition mean min max ZT0-3 5.643549999999999 5.643549999999999 5.643549999999999 ZT4-7 3.4246049999999997 3.4246049999999997 3.4246049999999997 ZT8-11 5.22409 5.22409 5.22409 ZT12-15 6.4658549999999995 6.4658549999999995 6.4658549999999995 ZT16-19 9.796115 9.796115 9.796115 ZT20-23 6.346575 6.346575 6.346575