condition mean min max ZT0-3 6.285775 5.507995 7.063555 ZT4-7 4.37387 4.37387 4.37387 ZT8-11 3.260875 3.260875 3.260875 ZT12-15 0 0 0 ZT16-19 7.128255 7.128255 7.128255 ZT20-23 5.695365000000001 5.695365000000001 5.695365000000001