condition mean min max ZT0-3 9.308824999999999 9.199005 9.418645 ZT4-7 7.738345000000001 7.738345000000001 7.738345000000001 ZT8-11 7.366720000000001 7.366720000000001 7.366720000000001 ZT12-15 0 0 0 ZT16-19 9.166875 9.166875 9.166875 ZT20-23 8.127775 8.127775 8.127775