condition mean min max ZT0-3 6.58312 6.4768550000000005 6.689385 ZT4-7 5.471780000000001 5.471780000000001 5.471780000000001 ZT8-11 4.45817 4.45817 4.45817 ZT12-15 0 0 0 ZT16-19 6.36928 6.36928 6.36928 ZT20-23 6.09939 6.09939 6.09939