condition mean min max ZT0-3 54.5 54.5 54.5 ZT4-7 41.1 41.1 41.1 ZT8-11 42.25 42.25 42.25 ZT12-15 45.0 45.0 45.0 ZT16-19 27.049999999999997 27.049999999999997 27.049999999999997 ZT20-23 50.05 50.05 50.05