condition mean min max ZT0-3 20.9335 15.8958 27.52745 ZT4-7 10.46618 10.46618 10.46618 ZT8-11 7.473165 7.473165 7.473165 ZT12-15 11.1200075 9.296665 12.943349999999999 ZT16-19 11.793700000000001 11.793700000000001 11.793700000000001 ZT20-23 16.56875 16.56875 16.56875