condition mean min max ZT0-3 4.6916425 3.949815 5.43347 ZT4-7 4.709524999999999 4.709524999999999 4.709524999999999 ZT8-11 2.66277 2.66277 2.66277 ZT12-15 0 0 0 ZT16-19 2.999255 2.999255 2.999255 ZT20-23 4.647729999999999 4.647729999999999 4.647729999999999