condition mean min max ZT0-3 19.9401386825 16.888023005 22.99225436 ZT4-7 9.33058313325 8.3278410205 10.333325246000001 ZT8-11 14.89440689 12.384365410000001 17.40444837 ZT12-15 17.2483117725 15.691807489999999 18.804816055 ZT16-19 20.9442497925 17.478490455 24.41000913 ZT20-23 35.509440855 31.480000885000003 39.538880825