condition mean min max ZT0-3 23.76275 14.786850000000001 32.73865 ZT4-7 4.548065 4.548065 4.548065 ZT8-11 3.44078 3.44078 3.44078 ZT12-15 0 0 0 ZT16-19 10.29553 10.29553 10.29553 ZT20-23 8.924 8.924 8.924