condition mean min max ZT0-3 31.42431666666667 15.41885 41.31845 ZT4-7 7.407585 7.407585 7.407585 ZT8-11 27.03425 27.03425 27.03425 ZT12-15 23.945875 23.46245 24.429299999999998 ZT16-19 29.01115 29.01115 29.01115 ZT20-23 47.28495 47.28495 47.28495