condition mean min max ZT0-3 789.9811666666667 711.912 854.864 ZT4-7 745.8525 745.8525 745.8525 ZT8-11 701.9345000000001 701.9345000000001 701.9345000000001 ZT12-15 885.81 804.1465000000001 967.4735 ZT16-19 756.8075 756.8075 756.8075 ZT20-23 613.898 613.898 613.898