condition mean min max ZT0-3 1.4948686814999999 0.590416816 2.399320547 ZT4-7 1.971861928 1.028396056 2.9153278 ZT8-11 3.5149508010000003 2.7490710280000004 4.280830574 ZT12-15 6.171037355499999 4.4446063334999995 7.897468377499999 ZT16-19 7.8422504395 6.466212648999999 9.21828823 ZT20-23 15.6816938275 13.018576450000001 18.344811205