condition mean min max ZT0-3 32.599999999999994 32.599999999999994 32.599999999999994 ZT4-7 33.3 33.3 33.3 ZT8-11 9.0 9.0 9.0 ZT12-15 35.75 35.75 35.75 ZT16-19 9.850000000000001 9.850000000000001 9.850000000000001 ZT20-23 28.549999999999997 28.549999999999997 28.549999999999997