condition mean min max ZT0-3 3.4027775 2.585395 4.22016 ZT4-7 6.238239999999999 6.238239999999999 6.238239999999999 ZT8-11 6.6344 6.6344 6.6344 ZT12-15 5.728651666666666 5.605283333333333 5.8520199999999996 ZT16-19 4.60013 3.4504099999999998 5.74985 ZT20-23 0 0 0