condition mean min max ZT0-3 3.1952450000000003 2.6252750000000002 4.16258 ZT4-7 1.9816850000000001 1.9816850000000001 1.9816850000000001 ZT8-11 1.58565 1.58565 1.58565 ZT12-15 3.06833 2.9718549999999997 3.1648050000000003 ZT16-19 3.62272 3.62272 3.62272 ZT20-23 3.56588 3.56588 3.56588