condition mean min max ZT0-3 36.74275 35.15325 38.33225 ZT4-7 29.4497 29.4497 29.4497 ZT8-11 21.725949999999997 21.725949999999997 21.725949999999997 ZT12-15 0 0 0 ZT16-19 34.3934 34.3934 34.3934 ZT20-23 30.41585 30.41585 30.41585