condition mean min max ZT0-3 7.374922 7.374922 7.374922 ZT4-7 7.082622000000001 7.082622000000001 7.082622000000001 ZT8-11 10.359676 10.359676 10.359676 ZT12-15 12.4186725 12.4186725 12.4186725 ZT16-19 35.213277 35.213277 35.213277 ZT20-23 115.8012265 115.8012265 115.8012265