condition mean min max ZT0-3 36.284875 27.3014 45.26835 ZT4-7 37.9439 37.9439 37.9439 ZT8-11 70.79509999999999 70.79509999999999 70.79509999999999 ZT12-15 0 0 0 ZT16-19 61.3959 61.3959 61.3959 ZT20-23 62.32355 62.32355 62.32355