condition mean min max ZT0-3 1.65672 1.5765799999999999 1.73686 ZT4-7 2.06867 2.06867 2.06867 ZT8-11 2.195455 2.195455 2.195455 ZT12-15 0 0 0 ZT16-19 2.785685 2.785685 2.785685 ZT20-23 3.67916 3.67916 3.67916