condition mean min max ZT0-3 3.07309675 0.0 6.1461935 ZT4-7 19.862524999999998 19.862524999999998 19.862524999999998 ZT8-11 1.681827 1.681827 1.681827 ZT12-15 0 0 0 ZT16-19 1.3565585 1.3565585 1.3565585 ZT20-23 11.26609 11.26609 11.26609