condition mean min max ZT0-3 0.7449629999999999 0.5531809999999999 0.9367449999999999 ZT4-7 0.67601 0.67601 0.67601 ZT8-11 2.05355 2.05355 2.05355 ZT12-15 0 0 0 ZT16-19 1.63211 1.63211 1.63211 ZT20-23 1.169693 1.169693 1.169693