condition mean min max ZT0-3 75.906087 75.906087 75.906087 ZT4-7 90.44679 90.44679 90.44679 ZT8-11 43.270026 43.270026 43.270026 ZT12-15 32.400734 32.400734 32.400734 ZT16-19 20.4612145 20.4612145 20.4612145 ZT20-23 19.851295 19.851295 19.851295