condition mean min max ZT0-3 2.2935499999999998 1.95918 2.62792 ZT4-7 2.382495 2.382495 2.382495 ZT8-11 2.53613 2.53613 2.53613 ZT12-15 0 0 0 ZT16-19 3.16819 3.16819 3.16819 ZT20-23 4.705795 4.705795 4.705795