condition mean min max ZT0-3 11.929775 11.530999999999999 12.32855 ZT4-7 14.003250000000001 14.003250000000001 14.003250000000001 ZT8-11 20.2763 20.2763 20.2763 ZT12-15 0 0 0 ZT16-19 18.41905 18.41905 18.41905 ZT20-23 12.17985 12.17985 12.17985