condition mean min max ZT0-3 2671.0 2671.0 2671.0 ZT4-7 4273.6 4273.6 4273.6 ZT8-11 5801.9 5801.9 5801.9 ZT12-15 7064.5 7064.5 7064.5 ZT16-19 7041.2 7041.2 7041.2 ZT20-23 4973.049999999999 4973.049999999999 4973.049999999999