condition mean min max ZT0-3 2.7722175 2.72635 2.818085 ZT4-7 1.7438449999999999 1.7438449999999999 1.7438449999999999 ZT8-11 1.951625 1.951625 1.951625 ZT12-15 0 0 0 ZT16-19 4.586385 4.586385 4.586385 ZT20-23 3.45603 3.45603 3.45603