condition mean min max ZT0-3 2.9363699999999997 1.69441 3.69101 ZT4-7 1.6576650000000002 1.6576650000000002 1.6576650000000002 ZT8-11 0.908482 0.908482 0.908482 ZT12-15 2.2778825 2.258825 2.29694 ZT16-19 2.60847 2.60847 2.60847 ZT20-23 3.215775 3.215775 3.215775