condition mean min max ZT0-3 4.79458815375 3.747715073 5.8414612345000005 ZT4-7 6.70792572025 5.1426948055 8.273156635 ZT8-11 3.47227327325 2.9756741245 3.968872422 ZT12-15 43.071921865250005 21.5082077705 64.63563596 ZT16-19 133.530773375 113.54589355 153.51565319999997 ZT20-23 170.50011625 154.26477799999998 186.7354545