condition mean min max ZT0-3 0.40937216666666665 0.32220899999999997 0.47948 ZT4-7 0.40301699999999996 0.40301699999999996 0.40301699999999996 ZT8-11 0.766925 0.766925 0.766925 ZT12-15 3.2835199999999998 2.3195449999999997 4.247495 ZT16-19 2.283125 2.283125 2.283125 ZT20-23 0.9967675 0.9967675 0.9967675