condition mean min max ZT0-3 334.539749 334.539749 334.539749 ZT4-7 367.0819225 367.0819225 367.0819225 ZT8-11 301.2190585 301.2190585 301.2190585 ZT12-15 350.665478 350.665478 350.665478 ZT16-19 271.0451385 271.0451385 271.0451385 ZT20-23 187.38235300000002 187.38235300000002 187.38235300000002