condition mean min max ZT0-3 5.437155000000001 5.234795 5.639515 ZT4-7 4.58657 4.58657 4.58657 ZT8-11 8.601614999999999 8.601614999999999 8.601614999999999 ZT12-15 0 0 0 ZT16-19 11.1692 11.1692 11.1692 ZT20-23 7.7516 7.7516 7.7516