condition mean min max ZT0-3 4.612375 4.612375 4.612375 ZT4-7 2.849635 2.849635 2.849635 ZT8-11 4.359 4.359 4.359 ZT12-15 3.69221 3.69221 3.69221 ZT16-19 5.9117 5.9117 5.9117 ZT20-23 5.63816 5.63816 5.63816