condition mean min max ZT0-3 0.209431325 0.12670915 0.2921535 ZT4-7 5.22837 5.22837 5.22837 ZT8-11 7.601865 7.601865 7.601865 ZT12-15 0 0 0 ZT16-19 4.23181 4.23181 4.23181 ZT20-23 1.086555 1.086555 1.086555