condition mean min max ZT0-3 21.4283 17.423949999999998 27.082250000000002 ZT4-7 22.089399999999998 22.089399999999998 22.089399999999998 ZT8-11 17.3631 17.3631 17.3631 ZT12-15 23.641849999999998 17.2854 29.9983 ZT16-19 27.120199999999997 27.120199999999997 27.120199999999997 ZT20-23 24.4692 24.4692 24.4692