condition mean min max ZT0-3 2.80304 2.80304 2.80304 ZT4-7 1.84752 1.84752 1.84752 ZT8-11 1.9835349999999998 1.9835349999999998 1.9835349999999998 ZT12-15 1.656945 1.656945 1.656945 ZT16-19 2.9262699999999997 2.9262699999999997 2.9262699999999997 ZT20-23 1.95682 1.95682 1.95682