condition mean min max ZT0-3 25.35345 17.87845 31.6297 ZT4-7 13.839500000000001 13.839500000000001 13.839500000000001 ZT8-11 17.20325 17.20325 17.20325 ZT12-15 23.935875 21.3294 26.54235 ZT16-19 28.466099999999997 28.466099999999997 28.466099999999997 ZT20-23 35.974149999999995 35.974149999999995 35.974149999999995