condition mean min max ZT0-3 16.698050000000002 16.698050000000002 16.698050000000002 ZT4-7 12.8781 12.8781 12.8781 ZT8-11 13.92445 13.92445 13.92445 ZT12-15 15.438649999999999 15.438649999999999 15.438649999999999 ZT16-19 19.66205 19.66205 19.66205 ZT20-23 17.461750000000002 17.461750000000002 17.461750000000002